Making Water on the Moon, The Hubble Bubble Hypothesis, and Neptune's Unique Orbital Partner
Astronomy Daily: Space News UpdatesJuly 19, 2025x
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00:13:4812.69 MB

Making Water on the Moon, The Hubble Bubble Hypothesis, and Neptune's Unique Orbital Partner

  • Revolutionising Lunar Exploration: Discover the groundbreaking research from a team of Chinese scientists who are developing innovative technology to produce water, oxygen, and fuel directly from lunar soil. This game-changing approach could significantly reduce the costs of transporting resources from Earth, making sustainable lunar habitats a reality. With the potential to utilise the Moon's own resources, this closed-loop system could transform our future in space.
  • - The Hubble Bubble Theory: Delve into the intriguing new theory suggesting our Milky Way galaxy might be suspended within a vast cosmic void, dubbed the Hubble Bubble. This concept could provide solutions to the ongoing Hubble Tension, offering fresh insights into the universe's expansion and our cosmic neighbourhood.
  • - A Cosmic Dance with Neptune: Learn about the newly discovered trans-neptunian object, 2020 VN40, which exhibits a unique orbital rhythm, completing one orbit for every ten of Neptune's. This fascinating discovery sheds light on the dynamics of distant solar system bodies and hints at the complexities of our solar system's evolution.
  • - Catching the Southern Delta Aquariad Meteor Shower: Prepare for the upcoming Southern Delta Aquariad meteor shower peaking on July 29. We provide tips on how to maximise your viewing experience, including the best times and locations to spot these shooting stars as Earth passes through the debris trail of comet 96P/Machholz.
  • For more cosmic updates, visit our website at astronomydaily.io. Join our community on social media by searching for #AstroDailyPod on Facebook, X, YouTube Music, TikTok, and our new Instagram account! Don’t forget to subscribe to the podcast on Apple Podcasts, Spotify, iHeartRadio, or wherever you get your podcasts.
  • Thank you for tuning in. This is Anna signing off. Until next time, keep looking up and stay curious about the wonders of our universe.
✍️ Episode References
Lunar Resource Utilisation
[Chinese University of Hong Kong](https://www.cuhk.edu.hk)
Hubble Bubble Theory
[Royal Astronomical Society](https://ras.ac.uk)
Trans-Neptunian Object Discovery
[Harvard-Smithsonian Center for Astrophysics](https://www.cfa.harvard.edu)
Southern Delta Aquariad Meteor Shower
[NASA](https://www.nasa.gov)
Astronomy Daily
[Astronomy Daily](http://www.astronomydaily.io/)

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00:00:00 --> 00:00:02 Anna: Welcome to Astronomy Daily, your daily dose

00:00:02 --> 00:00:05 of cosmic curiosities and stellar stories.

00:00:05 --> 00:00:07 I'm your host, Anna, and I'm thrilled to have

00:00:07 --> 00:00:09 you join us for another exciting journey

00:00:09 --> 00:00:12 through the universe. Today, we're diving

00:00:12 --> 00:00:15 into some fascinating breakthroughs. We'll

00:00:15 --> 00:00:17 explore how new technology might allow us to

00:00:17 --> 00:00:19 make water and fuel right on the moon,

00:00:19 --> 00:00:21 potentially changing the future of lunar

00:00:21 --> 00:00:24 exploration. We'll also ponder an intriguing

00:00:24 --> 00:00:27 theory that suggests our entire galaxy might

00:00:27 --> 00:00:29 be floating inside a massive cosmic void.

00:00:30 --> 00:00:33 A Hubble bubble, if you. Which could reshape

00:00:33 --> 00:00:34 our understanding of the universe's

00:00:34 --> 00:00:37 expansion. And for those who love to look up,

00:00:37 --> 00:00:39 we'll guide you on how to best catch an

00:00:39 --> 00:00:41 upcoming celestial spectacle. The Southern

00:00:41 --> 00:00:44 Delta Aquarian meteor shower. Plus, we've got

00:00:44 --> 00:00:46 a quirky tale about a newly discovered space

00:00:46 --> 00:00:48 rock doing a strange orbital dance with

00:00:48 --> 00:00:51 Neptune. So buckle up because there's a lot

00:00:51 --> 00:00:52 to unpack in today's episode.

00:00:54 --> 00:00:56 First up, let's talk about something that

00:00:56 --> 00:00:58 could truly revolutionise our future in

00:00:58 --> 00:01:01 space. Making essential resources

00:01:01 --> 00:01:04 directly on the moon. Imagine if

00:01:04 --> 00:01:06 astronauts didn't have to haul every drop of

00:01:06 --> 00:01:09 water or every breath of oxygen from Earth.

00:01:09 --> 00:01:11 Well, a team of researchers from China is

00:01:11 --> 00:01:13 working to make that a reality, developing a

00:01:13 --> 00:01:15 new technology that they say could produce

00:01:15 --> 00:01:18 water, oxygen and even fuel from lunar

00:01:18 --> 00:01:21 soil. This is a game changer because shipping

00:01:21 --> 00:01:23 just one litre of water to the moon currently

00:01:23 --> 00:01:26 costs a staggering 33 Australian

00:01:26 --> 00:01:27 dollars, which is roughly

00:01:27 --> 00:01:30 US$22. So

00:01:30 --> 00:01:32 finding ways to use the moon's own resources

00:01:32 --> 00:01:35 will be absolutely critical if humanity

00:01:35 --> 00:01:37 is going to return there and establish

00:01:37 --> 00:01:39 temporary or even long term habitats.

00:01:40 --> 00:01:41 The new approach uses what's called

00:01:41 --> 00:01:44 photothermal technology, detailed in a paper

00:01:44 --> 00:01:46 published in the journal Joule. Lunar soil

00:01:46 --> 00:01:49 isn't just inert dust. It actually holds

00:01:49 --> 00:01:51 stores of carbon dioxide and water, along

00:01:51 --> 00:01:52 with other minerals that could be incredibly

00:01:52 --> 00:01:55 useful for space mission crews. The real

00:01:55 --> 00:01:57 puzzle has always been how to extract these

00:01:57 --> 00:01:59 molecules efficiently on the moon's surface.

00:02:00 --> 00:02:02 As co author Lu Wang from the Chinese

00:02:02 --> 00:02:04 University of Hong Kong, Shenzhen, put it,

00:02:04 --> 00:02:07 they never fully imagined the magic that the

00:02:07 --> 00:02:10 lunar soil possessed. Wang's team had

00:02:10 --> 00:02:12 previously analysed lunar soil samples

00:02:12 --> 00:02:14 brought back by China's Chang's five

00:02:14 --> 00:02:17 spacecraft, discovering that moon dust indeed

00:02:17 --> 00:02:20 contains many useful compounds. Their latest

00:02:20 --> 00:02:22 research builds on this, showing it's

00:02:22 --> 00:02:24 possible to extract water from lunar soil.

00:02:24 --> 00:02:27 But it gets even more exciting. They can then

00:02:27 --> 00:02:29 use that extracted water and the carbon

00:02:29 --> 00:02:32 dioxide exhaled by astronauts

00:02:32 --> 00:02:35 to produce hydrogen gas and carbon monoxide.

00:02:35 --> 00:02:38 These products in turn can be used to create

00:02:38 --> 00:02:41 fuel and breathable oxygen. All

00:02:41 --> 00:02:43 that's needed to power this remarkable

00:02:43 --> 00:02:45 process is the photothermal technology,

00:02:46 --> 00:02:48 which efficiently converts sun sunlight into

00:02:48 --> 00:02:50 heat. The team was particularly

00:02:50 --> 00:02:53 surprised by the tangible success of this

00:02:53 --> 00:02:55 integrated method. They found that

00:02:55 --> 00:02:58 combining lunar water extraction with

00:02:58 --> 00:03:01 photothermal carbon dioxide catalysis could

00:03:01 --> 00:03:04 significantly enhance energy utilisation

00:03:04 --> 00:03:06 and reduce the cost and complexity of

00:03:06 --> 00:03:08 developing the necessary infrastructure on

00:03:08 --> 00:03:11 the Moon. It's a truly ingenious closed loop

00:03:11 --> 00:03:14 system. Now, while these lab experiments are

00:03:14 --> 00:03:16 a huge step forward, the researchers are also

00:03:16 --> 00:03:18 very realistic about the challenges ahead.

00:03:19 --> 00:03:21 They remind us that the Moon's extreme

00:03:21 --> 00:03:24 environment poses unique hurdles for

00:03:24 --> 00:03:27 implementing this technology. We're talking

00:03:27 --> 00:03:29 about drastic temperature fluctuations, an

00:03:29 --> 00:03:32 ultra high vacuum, intense solar radiation

00:03:32 --> 00:03:35 and low gravity. All of these factors

00:03:35 --> 00:03:37 complicate things considerably. Furthermore,

00:03:37 --> 00:03:40 lunar soil doesn't have a uniform composition

00:03:40 --> 00:03:42 across the Moon's surface. Some areas will

00:03:42 --> 00:03:44 naturally be richer in resources than others.

00:03:45 --> 00:03:47 And even with this innovative system, the

00:03:47 --> 00:03:50 carbon dioxide exhaled by astronauts might

00:03:50 --> 00:03:52 not be enough to meet all the water, fuel and

00:03:52 --> 00:03:54 oxygen needs for a larger base.

00:03:55 --> 00:03:57 Overcoming these technical hurdles, along

00:03:57 --> 00:03:59 with the significant development, deployment

00:03:59 --> 00:04:01 and operational costs, will be crucial to

00:04:01 --> 00:04:03 making sustainable lunar resource utilisation

00:04:03 --> 00:04:06 and space exploration a widespread reality.

00:04:06 --> 00:04:08 But but it's certainly a very promising start

00:04:10 --> 00:04:11 from the possibility of making our own

00:04:11 --> 00:04:12 resources on the Moon.

00:04:13 --> 00:04:15 Let's zoom out to a much grander scale.

00:04:15 --> 00:04:17 Remember how they were theorising that we

00:04:17 --> 00:04:20 might be living inside a black hole? Well, we

00:04:20 --> 00:04:22 have a new theory to ponder with an

00:04:22 --> 00:04:25 intriguing Are we here on Earth

00:04:25 --> 00:04:27 and our entire Milky Way galaxy actually

00:04:27 --> 00:04:30 trapped inside a giant cosmic void?

00:04:30 --> 00:04:32 This fascinating theory, based on echoes from

00:04:32 --> 00:04:35 the Big Bang, suggests exactly that.

00:04:35 --> 00:04:37 Researchers presenting at the Royal

00:04:37 --> 00:04:39 Astronomical Society National Astronomy

00:04:39 --> 00:04:42 meeting unveiled fresh evidence that our

00:04:42 --> 00:04:44 galaxy is suspended within a region of space

00:04:45 --> 00:04:47 that is less dense than the cosmic average.

00:04:48 --> 00:04:51 This vast 2 billion light year expanse has

00:04:51 --> 00:04:53 been dubbed the Hubble Bubble and it's

00:04:53 --> 00:04:55 estimated to be about 20% less dense than the

00:04:55 --> 00:04:57 average matter density across the universe.

00:04:58 --> 00:05:00 If this idea holds true, it it could provide

00:05:00 --> 00:05:02 a much needed solution to a persistent

00:05:02 --> 00:05:05 mystery in cosmology known as the Hubble

00:05:05 --> 00:05:07 Tension. This tension arises from

00:05:07 --> 00:05:09 conflicting measurements of the universe's

00:05:09 --> 00:05:11 expansion rate, which also impacts our

00:05:11 --> 00:05:14 understanding of its true age. One

00:05:14 --> 00:05:16 method based on analysing the cosmic

00:05:16 --> 00:05:19 microwave backgroundessentially. Cosmic

00:05:19 --> 00:05:21 fossils from the universe's first light

00:05:21 --> 00:05:24 suggests an expansion rate of 67 kilometres

00:05:24 --> 00:05:27 per second per megaparsec. However,

00:05:27 --> 00:05:29 a second method which measures distances

00:05:29 --> 00:05:32 using Type Ia supernovas and variable stars

00:05:32 --> 00:05:35 indicates a higher expansion rate of

00:05:35 --> 00:05:37 73.2 kilometres per second per

00:05:37 --> 00:05:40 megaparsec. That's a noticeable discrepancy

00:05:40 --> 00:05:43 The Hubble bubble theory posits that if the

00:05:43 --> 00:05:45 Milky Way is indeed situated within such a

00:05:45 --> 00:05:48 less dense region, then the local expansion

00:05:48 --> 00:05:50 inside this void would naturally appear

00:05:50 --> 00:05:53 faster than in the denser, more distant parts

00:05:53 --> 00:05:56 of the cosmos. Indranil Banik, the

00:05:56 --> 00:05:58 study's lead author, explained that a large

00:05:58 --> 00:06:01 local void would cause matter to be pulled by

00:06:01 --> 00:06:03 gravity towards its higher density exterior,

00:06:03 --> 00:06:06 making the void emptier over time. This

00:06:06 --> 00:06:08 effect would accelerate local expansion. For

00:06:08 --> 00:06:11 this theory to work, our galaxy would need to

00:06:11 --> 00:06:13 be located quite close to the centre of this

00:06:13 --> 00:06:15 low density Hubble bubble.

00:06:16 --> 00:06:19 Bannock and his team used data from baryon

00:06:19 --> 00:06:21 acoustic oscillations, the sounds of the Big

00:06:21 --> 00:06:24 Bang, to support previous research from the

00:06:24 --> 00:06:26 1990s that had already noted fewer

00:06:26 --> 00:06:28 galaxies in our local universe than expected.

00:06:29 --> 00:06:32 These ancient sound waves, frozen in place

00:06:32 --> 00:06:34 when the universe cooled, act like a standard

00:06:34 --> 00:06:37 ruler that allows astronomers to chart cosmic

00:06:37 --> 00:06:40 expansion history. What's truly striking

00:06:40 --> 00:06:43 is that their research found it's 100 times

00:06:43 --> 00:06:45 more likely that we live in a cosmic void

00:06:45 --> 00:06:47 than than in a region of average density.

00:06:48 --> 00:06:50 This suggests we might be in a very unique

00:06:50 --> 00:06:52 cosmic neighbourhood. The next steps for

00:06:52 --> 00:06:55 Banik and his team will involve comparing

00:06:55 --> 00:06:58 their void model to other cosmological

00:06:58 --> 00:07:00 models and exploring potential adjustments

00:07:01 --> 00:07:03 to the standard model of cosmology.

00:07:04 --> 00:07:06 It's, uh, a truly mind bending concept that

00:07:06 --> 00:07:09 could redefine our place in the universe

00:07:10 --> 00:07:12 from the vastness of the cosmos and potential

00:07:12 --> 00:07:13 cosmic voids.

00:07:14 --> 00:07:16 Let's bring our focus a little closer to

00:07:16 --> 00:07:18 home. Though still quite far out in our own

00:07:18 --> 00:07:21 solar system, astronomers have recently made

00:07:21 --> 00:07:23 an incredibly intriguing discovery. A

00:07:23 --> 00:07:25 peculiar space rock at the very edge of our

00:07:25 --> 00:07:28 solar system is locked in a fascinating

00:07:28 --> 00:07:31 rhythmic dance with Neptune. This Object,

00:07:31 --> 00:07:33 officially designated 2020 VN40,

00:07:34 --> 00:07:36 belongs to a group of distant solar system

00:07:36 --> 00:07:39 bodies known as Trans neptunian objects, or

00:07:39 --> 00:07:42 TNOs. What makes 2020

00:07:42 --> 00:07:45 VN40 so special is that it's the very first

00:07:45 --> 00:07:47 object ever found that orbits the sun exactly

00:07:47 --> 00:07:50 once for every 10 orbits Neptune completes.

00:07:51 --> 00:07:53 Considering that one Neptunian year stretches

00:07:53 --> 00:07:56 across a remarkable 164.8

00:07:56 --> 00:07:58 Earth years, this means 2020

00:07:58 --> 00:08:01 VN40 has an incredibly long year,

00:08:01 --> 00:08:04 lasting approximately 1

00:08:04 --> 00:08:07 Earth years, or nearly 20 Earth months.

00:08:08 --> 00:08:11 Researchers believe this slow ponderous

00:08:11 --> 00:08:13 orbital dance with Neptune might have begun

00:08:13 --> 00:08:15 when the ice giant's gravity temporarily

00:08:15 --> 00:08:18 snared it. This discovery is a significant

00:08:19 --> 00:08:21 step in understanding the dynamics of objects

00:08:21 --> 00:08:24 at the solar system's fringe. As

00:08:24 --> 00:08:25 Rosemary pike from the Centre for

00:08:25 --> 00:08:27 Astrophysics at Harvard and Smithsonian

00:08:27 --> 00:08:30 noted, it shows that Even very distant

00:08:30 --> 00:08:33 regions influenced by Neptune can contain

00:08:33 --> 00:08:36 objects. And it gives us new clues about how

00:08:36 --> 00:08:39 the solar system evolved. The unique

00:08:39 --> 00:08:41 orbital rhythm of 2020 VN40

00:08:42 --> 00:08:44 was unearthed from data collected by the

00:08:44 --> 00:08:47 Large Inclination distant objects, or LIDO

00:08:47 --> 00:08:49 survey. This survey specifically hunts for

00:08:49 --> 00:08:51 TNOs with orbits that carry them far above

00:08:51 --> 00:08:53 and below the main orbital plane of Earth

00:08:53 --> 00:08:56 around the Sun. Exploring previously

00:08:56 --> 00:08:59 uncharted areas of our solar system, what

00:08:59 --> 00:09:02 truly sets 2020 VN4.0 apart is

00:09:02 --> 00:09:04 its unusual perihelion alignment with

00:09:04 --> 00:09:07 Neptune. Most other bodies in rhythmic

00:09:07 --> 00:09:09 alignment with Neptune make their closest

00:09:09 --> 00:09:12 approaches to the sun when Neptune is at its

00:09:12 --> 00:09:14 farthest. But 2020 VN4.0

00:09:14 --> 00:09:17 defies this trend, reaching its perihelion

00:09:17 --> 00:09:20 when Neptune is also relatively close to the

00:09:20 --> 00:09:22 Sun. While this might sound like they're side

00:09:22 --> 00:09:24 by side, 2020

00:09:24 --> 00:09:27 VN4.0's highly tilted path means it's

00:09:27 --> 00:09:29 actually far below the solar system's plane

00:09:29 --> 00:09:32 during this alignment. This new motion,

00:09:32 --> 00:09:34 as Ruth Murray Clay from the University of

00:09:34 --> 00:09:37 California, Santa Cruz described it, is

00:09:37 --> 00:09:39 like finding a hidden rhythm in a song we

00:09:39 --> 00:09:42 thought we knew. It suggests that objects

00:09:42 --> 00:09:44 with highly tilted orbits can adopt novel and

00:09:44 --> 00:09:47 unexpected types of, um, movement, revealing

00:09:47 --> 00:09:49 more complexity in our solar system than

00:09:49 --> 00:09:52 previously imagined. The hunt is now on for

00:09:52 --> 00:09:55 more bodies like 2020 VN4.0, with the

00:09:55 --> 00:09:57 new Vera C. Rubin Observatory poised to play

00:09:57 --> 00:09:59 a crucial role in this exciting

00:09:59 --> 00:10:02 investigation. This discovery truly opens a

00:10:02 --> 00:10:03 new window into the solar system's past.

00:10:05 --> 00:10:07 And now for something you can enjoy right

00:10:07 --> 00:10:08 here on Earth, if you know where to look.

00:10:09 --> 00:10:12 The 2025 Southern Delta Aquariad meteor

00:10:12 --> 00:10:15 shower is upon us, with its peak expected on

00:10:15 --> 00:10:17 July 29. This annual shower is

00:10:17 --> 00:10:20 active from July 18 to August 12 as

00:10:20 --> 00:10:22 our planet drifts through an ancient trail of

00:10:22 --> 00:10:25 debris. This debris is thought to have been

00:10:25 --> 00:10:27 shed by a 4 mile wide comet named

00:10:27 --> 00:10:30 96PMachholz. When these tiny

00:10:30 --> 00:10:32 particles hit Earth's atmosphere, the

00:10:32 --> 00:10:34 friction makes them ignite, creating those

00:10:34 --> 00:10:36 beautiful streaks of light we call shooting

00:10:36 --> 00:10:39 stars. The shower is at its strongest in the

00:10:39 --> 00:10:42 week around its July 29 peak, when you

00:10:42 --> 00:10:44 might spot up to eight faint meteors per

00:10:44 --> 00:10:46 hour. These shooting stars will appear to

00:10:46 --> 00:10:49 emanate from a specific patch of sky known as

00:10:49 --> 00:10:51 a radiant within the constellation Aquarius,

00:10:52 --> 00:10:54 very close to the bright star Delta Aquarii,

00:10:54 --> 00:10:57 which gives the shower its name. For the

00:10:57 --> 00:10:59 best chance to spot a southern Delta

00:10:59 --> 00:11:01 Aquariad, aim for the early morning hours in

00:11:01 --> 00:11:04 the week surrounding July 29th. During

00:11:04 --> 00:11:06 this time, the radiant will be highest in the

00:11:06 --> 00:11:09 southern sky, and the waxing crescent Moon

00:11:09 --> 00:11:12 will be well below the horizon, ensuring a

00:11:12 --> 00:11:15 dark canvas for your meteor hunt. As its name

00:11:15 --> 00:11:17 suggests, this shower is most visible to

00:11:17 --> 00:11:19 stargazers in the southern hemisphere, where

00:11:19 --> 00:11:22 the radiant will be higher in the post sunset

00:11:22 --> 00:11:24 sky. However, don't despair if you're north

00:11:24 --> 00:11:27 of the equator, the shower will still be

00:11:27 --> 00:11:30 visible just at a slightly lower hourly rate.

00:11:31 --> 00:11:33 To maximise your chances, first locate the

00:11:33 --> 00:11:35 bright star Delta Aquarii in the

00:11:35 --> 00:11:37 constellation Aquarius above the southern

00:11:37 --> 00:11:40 horizon, or use a stargazing app to guide

00:11:40 --> 00:11:43 you. Then find a patch of sky about

00:11:43 --> 00:11:45 40 degrees away from this radiant in the

00:11:45 --> 00:11:48 direction directly above your head. As a

00:11:48 --> 00:11:50 handy guide, the width of your outstretched

00:11:50 --> 00:11:52 fist, from your thumb to the outside of your

00:11:52 --> 00:11:54 little finger, covers about 10 degrees in the

00:11:54 --> 00:11:57 night sky. Meteors seen further from

00:11:57 --> 00:12:00 the radiant wheel often have longer trails,

00:12:00 --> 00:12:03 making them easier to spot. You'll also have

00:12:03 --> 00:12:05 a much better chance if you head away from

00:12:05 --> 00:12:07 city lights and give your eyes about 30

00:12:07 --> 00:12:09 minutes to fully adapt to the darkness.

00:12:10 --> 00:12:13 After that, simply lie back, perhaps in a

00:12:13 --> 00:12:15 comfortable deck chair, and lose yourself in

00:12:15 --> 00:12:18 the night sky. Keep an eye out for bright

00:12:18 --> 00:12:19 meteors streaking across the sky from the

00:12:19 --> 00:12:22 north too. If you see one, you might have

00:12:22 --> 00:12:24 spotted a member of the Perseid meteor

00:12:24 --> 00:12:27 shower, which is also active since mid July.

00:12:27 --> 00:12:30 Happy stargazing? And that

00:12:30 --> 00:12:32 brings us to the end of another fascinating

00:12:32 --> 00:12:35 journey through the cosmos. Today we've

00:12:35 --> 00:12:37 explored the innovative possibilities of

00:12:37 --> 00:12:39 extracting water and fuel from lunar soil,

00:12:40 --> 00:12:42 pondered whether our Milky Way galaxy is

00:12:42 --> 00:12:45 truly nestled within a vast cosmic void,

00:12:45 --> 00:12:47 and discovered a new, intriguing dance

00:12:47 --> 00:12:49 partner for Neptune in the outer solar

00:12:49 --> 00:12:51 system. And of course, we learned how to

00:12:51 --> 00:12:53 catch a glimpse of the beautiful southern

00:12:53 --> 00:12:56 Delta Aquarid meteor shower. Thank you

00:12:56 --> 00:12:59 for joining me, Anna, on Astronomy Daily.

00:13:00 --> 00:13:02 Don't forget, you can dive deeper into all

00:13:02 --> 00:13:04 the latest space and astronomy news by

00:13:04 --> 00:13:06 visiting our website@astronomydaily.IO.

00:13:07 --> 00:13:09 there you can sign up for our free daily

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00:13:23 --> 00:13:24 keep looking up.