S26E97: Revolutionary Gravity, Early Universe, Lunar Milestone, and More
SpaceTime with Stuart GaryAugust 14, 2023x
97
00:27:3125.25 MB

S26E97: Revolutionary Gravity, Early Universe, Lunar Milestone, and More

**1. A New Gravity Perspective:** Evidence points towards modified Newtonian dynamics (MOND). This potential shift in understanding gravity could rival the significance of general relativity. The scientific community awaits further confirmation.
**2. Delving into the Universe's Infancy:** The Australian National University spearheads a groundbreaking research project. Dive deep into the early universe in three dimensions, exploring the formation of its first elements post the big bang, 13.8 billion years in the past.
**3. Chandrayaan-3's Lunar Feat:** India's ambitious lunar mission, Chandrayaan-3, achieves a pivotal milestone by successfully transitioning into a lunar orbit.
**4. The Science Report Highlights:** - A new variant of COVID-19 emerges, rapidly becoming dominant. - The Great Barrier Reef faces potential irreversible damages due to climate change. - Discoveries hint at possibly the largest animal ever to have existed.
**5. Skeptic's Corner:** A light-hearted guide to the concept of marrying a ghost.

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00:00:00
This is Space Time series 26 episode 97 for broadcast on the

00:00:04
14th of August 2023. Coming up on Space Time, what could be the

00:00:10
biggest revolution in science since general relativity theory

00:00:14
unlocking the early universe in three dimensions and India's

00:00:18
Chandra in three enters lunar orbit. All that and more. Coming

00:00:23
up on Space Time.

00:00:26
Welcome to Space Time with Stuart Garry.

00:00:46
It could be the biggest revolution in science since

00:00:49
general relativity. But it's not there yet. A new study claims to

00:00:53
have confirmed modified Newtonian dynamics or mod which

00:00:57
is a variation of science's current understanding of gravity

00:01:01
under special circumstances. If correct, the immense

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implications will be profound for all of astrophysics for

00:01:08
theoretical physics.

00:01:09
And of course for cosmology in its simplest terms, it would

00:01:14
completely change science's understanding of the universe.

00:01:18
It would also be vindication for theoretical physicist mode Hai

00:01:21
Milgram from the Weisman Institute in Israel who 40 years

00:01:25
ago first calculated his revolutionary theoretical

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framework, famously known today as modified Newtonian dynamics

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or Mond.

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The authors of the latest research claim their discovery

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which has been reported in the Astrophysical Journal has met

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the conventional five sigma criteria needed for a new

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scientific discovery, if confirmed, it would resolve the

00:01:47
long standing mystery of dark matter, that invisible substance

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that makes up over 80 per cent of the mass of the universe, but

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which interacts only gravitationally with

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conventional so called bionic matter.

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The stuff that makes up everything we see in the

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universe from stars and planets down to dogs, cats, cats,

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horses, trees, and people scientists know dark matter is

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real only because they can see its effect on Galaxies,

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providing the extra mass and hence the extra gravity needed

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to hold them together as they rotate, preventing them from

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flinging apart.

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However, if gravity was just a little bit different under

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certain conditions, you wouldn't need dark matter, it may not be

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real.

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After all, this new study is based on data collected by the

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European Space Agency's Gaer mission which has been gathering

00:02:34
observations on the exact position and movement of

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billions of stars in our galaxy, including their speed and

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direction. In other words, their proper motion through space.

00:02:44
The study's lead author, Q Yun Chee from the Sigo University in

00:02:47
Seoul decided to examine not the rotation of entire Galaxies but

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the orbital motions of long period, widely separated binary

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star systems, which he refers to as white binaries galactic discs

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and wide binaries share some similarities in their orbits.

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Although wide binaries follow highly elongated orbits, while

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hydrogen gas particles in the galactic disc follow nearly

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circular orbits by taking their measurements to the limit of

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verifiable analysis. Cha and colleagues were able to provide

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what they claim is conclusive evidence of the breakdown of

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standard gravity in low acceleration situations in

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binary star systems.

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Put simply they discovered a difference in the way gravity

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was acting, which doesn't match the Standard Newtonian model in

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order to get as much data as possible.

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He repeated the observations on 26 wide binaries within the

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650 light years observed by GAA getting the same effect each

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time Chee's study focused on calculating the gravitational

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accelerations experienced by binary stars as a function of

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their separation or equivalently the orbital period by a mighty

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Carlo de projection of observed sky projected motions in three

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dimensional space.

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He found that when two stars orbit around each other with

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accelerations lower than about one nanometer per second

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squared, they start to deviate from the predictions of Newton's

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universal law of gravitation.

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And Einstein's General Relativity theory. In fact, for

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accelerations lower than about 0.1 nanometers per second

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squared, the observed acceleration was about 30 to 40

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per cent higher than the Newton Einstein predictions.

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In a sample of 20 wide binaries within a distance of

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650 light years, two independent acceleration bins respectively

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showed deviations of over five sigma significance in the same

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direction because the observed acceleration is stronger than

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about 10 nanometers per second squared. All agreed with

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Newtonian Einsteinian predictions from the same

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analysis.

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The observed boost in accelerations at lower

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accelerations is a mystery. Now what was intriguing about this

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breakdown of Newtonian Einstein theory at accelerations weaker

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at about one nanometer per second squared is exactly what

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mode Milgram first suggested in his own theoretical work on

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modified Newtonian dynamics or Mond.

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Moreover, the boost factor of about 1.4 is correctly predicted

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by a mod type Lagrangian theory of gravity known as aquel, which

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was proposed by Milgram. And the late physicist Jacob Beckstein.

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What is remarkable is that the correct boost factor requires

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the external field effect from the milky way galaxy. That's a

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unique prediction of Monn type modified gravity. So what the

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wide binary data shows is not just the breakdown of Newtonian

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dynamics but also the manifestation of the external

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field effect of modified gravity.

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Unlike galactic rotation curves in which the observed boosted

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accelerations can at at least in principle be attributed to dark

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matter. In the Newtonian Einstein standard gravity model

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wide binary dynamics can't be affected by it even if it

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existed.

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Standard gravity simply breaks down in the weak acceleration

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limit in accordance with the mon framework. Now, if it's all

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verified, the implications of wide binary dynamics will be

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profound just as anomalies in mercury's orbit observed in the

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19th century, eventually led to Einstein's General Relativity.

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Now anomalies in wide binaries will require a new theory

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extending general relativity to the low acceleration mind limit.

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Despite all the success of Newtonian gravity, Einstein's

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General Relativity is still needed for relativistic

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gravitational phenomena such as black holes and gravitational

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waves.

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Likewise, despite all the successes of general relativity,

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a new theory beyond this is needed for Mond phenomena in the

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weak acceleration limit. Now if confirmed, it would mean that

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because gravity follows Mond, a large amount of dark matter in

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Galaxies in the universe as a whole are no longer needed.

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As for the man who came up with the idea in the first place.

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Well Milgram put it simply, he says it would mean a new

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revolution in physics was underway, but for such a far

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reaching finding and it is indeed very far reaching science

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requires confirmation by independent analysis with

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preferably even better future data.

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Milgram says if the anomaly is confirmed as a breakdown of

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Newtonian dynamics and especially if it indeed agrees

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with the most straightforward predictions of Mond, it will

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have enormous implications for astrophysics for cosmology and

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for fundamental physics at large.

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And I guess if that's the case, I hope you remember where you

00:07:27
heard it first. This is Space Time still to come unlocking the

00:07:33
early universe in three dimensions. And India's Chan in

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three spacecraft enters lunar orbit, all that and more still

00:07:40
to come on Space Time.

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The Australian National University is continuing to lead

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a key project studying the formation of some of the first

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elements to form in the universe. Following its creation

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of the Big Bang 13.82 billion years ago.

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This decade long project has been looking back in in the

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infancy of the universe, especially at a watershed event

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that dramatically changed the cosmos as we know it from a

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neutral and dark place to one being almost completely ionized

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and transparent. Basically giving us the universe we have

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today. It's a period known as the epoch of re ionization a

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time when the first structures in the universe were formed.

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Despite its pivotal role, the epoch of realization is one of

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the least understood phases in the history of the universe. The

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project under the umbrella of Astro 3D, formerly Castro 3D

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seeks to answer significant questions about this time in

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cosmic history such as where did the energy to ionize the entire

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universe come from?

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And was it simply ultraviolet light from the first stars? Or

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were there other forces at play exactly? When did the veil of

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the cosmic dark ages rise?

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And how long did it take tracing the distribution of matter from

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the earliest times of the universe through to the present

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day will help astronomers build a three dimensional picture of

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the formation and evolution of the universe as we see it today.

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Astronomers need to know how the structures of the universe, the

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cosmic web as we see it now grew out of matter forming the

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building blocks of the Galaxies like our own milky way.

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And also what forces shape the accumulation and motion of

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matter in the universe across space and time to achieve these

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goals. Scientists including Professor Lisa Curley are

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developing a new generation of instruments to view the sky in

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more exquisite three dimensional observations than ever before.

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The work is being funded by the Australian Research Council's

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Center Of Excellence For All Sky Astrophysics in three

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dimensions. It's helping to unlock secrets of the early

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universe and study the development of elements that

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make up the periodic table.

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Kiley says the project's investigating nothing less than

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how the universe formed its first matter in the dark moments

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after the Big Bang, how the first stars and Galaxies formed

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and evolved into the Galaxies we see today Galaxies like our

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milky way and how stars created the chemical elements that bat

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the universe as we see it.

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Now, the research is being conducted by a team of around

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200 scientists and engineers from around the world. Part of

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the project involves the development of new high tech

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instruments.

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These are going to be crucial not just for this project but

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also for the next generation of giant optical and radio

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telescopes such as the giant Magellan telescope and the

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square kilometer array. Kelley says by using the newly

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developed three dimensional technology on current optic and

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radio telescopes, scientists will be able to build a picture

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of how Galaxies formed and evolved across cosmic time.

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The technology is helping scientists build three

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dimensional models which are pinpointing which materials

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formed in the early universe and map where those elements and

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stars were born and also how they evolved into the universe

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that we live in today.

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So we're aiming to radio and optical telescopes combined with

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supercomputers to understand how the matter and the chemical

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elements in the universe formed and evolved across cosmic time.

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The way we currently see the is that the Big Bang itself created

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when the universe cooled down enough from a quark gluon plasma

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created the first elements of hydrogen and helium and maybe a

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bit of lithium and brill too. And after that, the sort of took

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over that process.

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That's right. And so this is a these other elements, in

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particular, the carbon and the nitrogen and oxygen.

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And we think these are made either stars during their

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lifetimes, especially big stars, the population three stars, for

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example, would have been huge, they would, they would have made

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huge amounts of these elements and the other elements, the

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heavier elements were made when these stars went supernova. That

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's correct.

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So there's multiple stars that we need to look at and we have

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detailed simulations of entire stellar populations where so we

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have a big series program in the Center Of Excellence where we're

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generating whole populations of stars and enjoying them together

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to create simulations of Galaxies.

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Are we looking at watching them evolve and see how they change

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with age through time?

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Yeah, that's right. So in the simulations, we can do that. And

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then with observations, what we're going to be doing is we're

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going to be using the milky way to look at stars that formed at

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different times. We're going to be looking for the oldest stars

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in the milky way, which could be the first stars that formed in

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the universe.

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And also we're going to be then looking at the first Galaxies

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that formed in the universe, be doing that directly with the

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James Webb space telescope. And after that, we'll be looking at

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Galaxies at all different distances from us. And with

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that, we can actually look back in time many billions of years.

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We've used the Hubble space telescope to look at very

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distant Galaxies and those Galaxies look very different to

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the Galaxies that we see today. So the distant Galaxies in the

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very early universe were very clumpy and lumpy and very messy

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looking.

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They don't anything like our beautiful spiral milky way

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galaxy or the elliptical smooth Galaxies that we have around us.

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So we're hoping to look back even earlier to look at the

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building blocks of those Galaxies, the smaller clumps of

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matter and the smaller clumps of star formation in the very early

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universe to see Galaxies when they were actually first forming

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one of.

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The big hopes of James Webb. Also, I guess a dream for many

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astronomers is to actually see a population three star.

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Yes, that's right. So that's one of the hopes for this center as

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well is to see a population three star. And we're aiming to

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do it in two ways with the space telescope. But also by looking

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at studies of millions of stars in our milky way, these

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population.

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Three stars are very important. These first stars, they're very

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different from the stars we see today, aren't they?

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They are, they've got a very strange amount of elements in

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them. They're very pristine. They've got hardly any elements

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that we have around today in our milky way. So for example, if

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we're looking at, they're looking at the oxygen or the

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iron in them, they can have very, very little oxygen or iron

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when you have.

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That sort of lack of metallic, which is what we refer to when

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we talk about elements other than hydrogen and helium on the

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periodic table. When you have so little metallic that must make

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the star look very different. It must be a very different type of

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star to what we have today in terms physically of size and

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mass.

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Haven't found them quite yet. We found stars that are very close

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but not quite discovered those first stars, the Galaxies were

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very messy, they were clumpy and some of the Galaxies were very,

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very blue compared to today. They had much more star

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formation. They had much more star formation happening per

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given volume than they do in Galaxies today.

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30 times more than the milky way does.

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Now, back then, we are discovering Galaxies with spiral

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arms that have already been cleanly formed around six or 7

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billion years ago. So they must have started forming earlier

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galaxy clusters.

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Some of them are believed to have been formed very early on

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too.

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Yes, the galaxy clusters seem to have been formed many billions

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of years ago, maybe eight or even 10 billion years ago. The

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first clusters would have been forming and we've been looking

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at some nearby what we call nearby galaxy clusters. They're

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actually about 8 billion years ago. We looked back in time and

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we're both looking at understanding the star formation

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happening within the galaxy clusters.

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And also we're using them as gravitational lenses. The big

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galaxy clusters bend the light from background Galaxies and

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magnify it and allow us to see the light from the background

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Galaxies that it would be far too faint for us to see with our

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modern day telescopes. So the galaxy clusters are useful for

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many different reasons.

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Is it fair to think that because the universe was a physically

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smaller place back then, hadn't spread out as much, hadn't

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expanded as much. That makes perfect sense that there would

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have been galaxy clusters so early on.

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Yes. So we think that Galaxies were having lots more collisions

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and were much closer together in the past. And we think that that

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also contributed to the large amount of star formation that

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we, that we see in the early universe.

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When Galaxies collide together or pass close by each other,

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there's a lot of gas collisions happening within the galaxy,

00:16:25
their gravitational potentials are disrupted and there's tidal

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forces large, occurring through the galaxy. And then this causes

00:16:33
gas collisions which then causes star formation to happen in the

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densest regions of the gas.

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Why is ionization important? What does that tell us about?

00:16:42
Well, the universe we live in.

00:16:43
Ionization is incredibly important because this was the

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time when the universe changed from being in the dark ages to

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the lit universe, when the first stars and the first Galaxies and

00:16:54
the first black holes lit up the universe. And this, it was

00:17:00
basically a watershed event in the history of the universe.

00:17:03
And it was the first time ionizing radiation radiation

00:17:07
that rips electrons off atoms. It's the first time that that

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was produced in the universe and our current universe is 99 per

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cent ionized and how it got to this state is unknown. And that

00:17:18
's one of the goals of this center to explain how the

00:17:22
universe reached this level of ionization.

00:17:24
That's Professor Lisa Curley from the Australian National

00:17:27
University and this is Space Time still to come. India's

00:17:32
Chandra and three spacecraft enters lunar orbit. And later in

00:17:36
the science report, a new strain of COVID-19 that's fast becoming

00:17:40
one of the most prevalent variants, all that and more

00:17:43
still to come on Space Time.

00:18:01
India's Chandra Three spacecraft has successfully transitioned

00:18:05
from an earth centric to a lunar centric orbit. Marking a major

00:18:10
milestone in India's ambitious lunar project. The Israel or

00:18:14
Indian Space Research Organization spacecraft is

00:18:17
carrying the moon mission three lander which is stated to

00:18:20
descend to the lunar surface on August.

00:18:22
The 23rd mission managers say their 3900 kg spacecraft is

00:18:28
performing nominally the probe successfully undertaken a series

00:18:31
of planned orbital reduction maneuvers designed to tighten

00:18:35
its orbit and these will continue throughout the coming

00:18:37
week.

00:18:38
Then the Vikram lander will be deployed to begin its journey

00:18:41
down to the lunar surface. The target is the moon's little

00:18:45
explored South Pole Region. If successful India will become the

00:18:49
fourth nation to have achieved a soft landing on the moon behind

00:18:53
the Soviet Union, the United States and China.

00:18:56
Once on the ground, Vikram will release the 26 kg program.

00:19:00
Rover, the tiny six wheeled vehicle will explore the moon's

00:19:03
South Pole Region examining the moon's surface composition, its

00:19:07
thin exosphere and its tectonic activity. The presence of water

00:19:12
at the bottom of craters in permanently shadowed areas of

00:19:15
the moon's South Pole will be of special interest for this

00:19:18
mission.

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We'll keep you informed. This is Space Time and time now to take

00:19:40
a brief look at some of the other stories making news in

00:19:42
science this week where the science report a new strain of

00:19:46
COVID-19 is fast becoming one of the most prevalent variants of

00:19:50
the disease in the United Kingdom in the United States and

00:19:53
Australia will most likely be next.

00:19:56
America's CDC says the COVID sub variant eeg 5.1 1st showed up in

00:20:02
February and quickly began dominating cases in the process.

00:20:06
Joining the other seven common variants circulating throughout

00:20:09
the community which are now being monitored by the World

00:20:11
Health Organization Immunity researcher, Professor Cassandra

00:20:15
Berry from Murdoch University says the E 5.1 variant is

00:20:19
descended from the lineage of the omicron variant of SARS COV

00:20:23
two that suggests that immunity to mico will provide a level of

00:20:28
protection against the new strain and lower the disease

00:20:31
severity.

00:20:32
But she says it's still important for people to stay up

00:20:34
to date with their vaccination boosters as the threat of

00:20:37
disease from these pandemic viruses is not over right now.

00:20:42
Some 7 million people have been killed by the COVID-19

00:20:45
Coronavirus since it was first detected near China's Wuhan

00:20:49
Institute Of Virology. Back in September 2019, the World Health

00:20:54
Organization estimates the true death toll is likely to be

00:20:57
around 18 million with some 768 million confirmed cases

00:21:01
globally, almost 10 per cent of the planet's population.

00:21:06
A new report warns that the Great Barrier Reef is likely to

00:21:10
face impacts from climate change that could become irreversible

00:21:14
around mid century regardless of whether global emissions

00:21:17
stabilize. That's the latest warning contained in a new study

00:21:21
by the Australian Academy Of Sciences. The report explores

00:21:25
different possible future scenarios for the Great Barrier

00:21:28
Reef under different emission levels.

00:21:31
A total of 84 multidisciplinary experts joined the roundtable

00:21:34
discussions. The first on climate impacts on functions of

00:21:37
the Great Barrier Reef. The second on interventions and the

00:21:41
third on the future of the reef. The report makes it clear that

00:21:45
climate change remains the primary threat to this global

00:21:49
icon and its connected systems.

00:21:52
Scientists have discovered the remains of what might well be

00:21:55
the largest animal that ever lived. The 39 million year old

00:21:59
whale fossils reported in the journal nature were uncovered in

00:22:03
southern Peru and include 13 vertebra, four ribs and a hip

00:22:07
from a bacillus Sauro whale estimated to have been somewhere

00:22:10
between 85 and 340 tons in weight.

00:22:14
Paleontologists say that at the higher end of this estimated

00:22:17
range, the whale named Pertus Colossus would have been both

00:22:21
longer and heavier than a blue whale which at 29.9 m in length

00:22:25
and a mass of up to 219 tons is currently believed to be the

00:22:29
biggest animal that ever lived.

00:22:31
The authors say the buoyancy associated with the increase in

00:22:35
bone mass is consistent with a shallow water lifestyle,

00:22:38
supporting the idea that Bacillus Soros were hyper

00:22:41
specialized for coastal environments.

00:22:45
If you're trying to become a famous mega rock star, but the

00:22:48
talent trains already left the station. What do you do? Well,

00:22:52
you marry a ghost of course, just before you release your

00:22:55
latest album and make sure as many people know about it as

00:22:57
possible. However, as Tim Mendham from Australian Skeptics

00:23:01
reports, it's a marriage that never really had a ghost of a

00:23:04
chance.

00:23:05
There's a singer in the UK named Brock Hard, who supposedly

00:23:09
married a ghost a few years ago to the surprise of her fans, I

00:23:13
presume she had some fans and she married this ghost an

00:23:15
interesting experience and a sad person down the road. And now

00:23:21
she's actually found out that the marriage wasn't as good. It

00:23:23
was going to be.

00:23:26
It never goes to a chance. Right.

00:23:28
And so she's now getting divorced from the ghost. I

00:23:31
really don't know whether the ghost worries about those legal

00:23:35
niceties of having a bit of paper saying you're divorced. So

00:23:37
she turned to an exorcist to end her tumultuous marriage after

00:23:41
five miserable months of being married to the paranormal

00:23:43
character.

00:23:44
Ok. That was a relationship that worked well or didn't last that

00:23:47
long. But you said it was like carrying a huge weight I didn't

00:23:49
think were heavy anyway, but never mind carrying a huge

00:23:52
weight around the responsibility, I suppose of

00:23:54
looking after a ghost.

00:23:55
What responsibility? I mean, ghosts are pretty well self

00:23:58
cleaning.

00:23:59
They don't live in me around the house. Normally they don't have

00:24:02
a lot of clothes to worry about. Exactly. Nothing to wash sheets.

00:24:07
Maybe we had to patch up those holes where the eyes are that

00:24:13
the strange thing is you sort of wonder what this is about?

00:24:16
No, I mean, I just don't think she got the spirit of things.

00:24:19
Yeah. Thank you. You wonder why it was happening? And she, her

00:24:22
ghost was named Eduardo with a w, not an Eduard but Eduardo and

00:24:27
she was looking forward to starting a new life. I don't

00:24:29
think they were going to have a family but never mind. But why

00:24:31
was it happening? She's a musician and, oh, she's got a

00:24:33
new record coming out. Pardon? My cynicism.

00:24:35
But I would suggest she's trying to get publicity and she was

00:24:38
trying to get publicity for the first time when she got married.

00:24:41
Now she's trying to get publicity because of the divorce

00:24:43
and that's me being terribly cynical, but she's a person. If

00:24:45
you go onto the news sites and have a look at the stories about

00:24:48
her, she's a person who loves to pose, she's posing in

00:24:50
cemeteries.

00:24:51
She sort of coy look and the heavy on the eye makeup and all

00:24:53
that sort of, it's all about me. I think it is all about her.

00:24:57
Yeah. And I think she's trying to muster up some publicity for

00:25:00
her new record coming out just now. I don't know what it sounds

00:25:03
like. I haven't heard the record. It might be played

00:25:05
backwards.

00:25:06
It's one of those sort of sad but interesting stories that we

00:25:10
get hit with a lot of.

00:25:11
It's like watching the Sussex, isn't it? You know, we want

00:25:14
privacy, we want privacy.

00:25:17
It's also very much you wonder. I don't think most people take

00:25:21
it that seriously. So, I don't think it's going to be the end

00:25:23
of the world sort of story if she gets divorced and then

00:25:25
remarried again. You know, it's one of those.

00:25:27
Things that's Tim Mendham from Austria in Skeptics and that's

00:25:47
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