Mysterious Interstellar Object 3i Atlas: The interstellar object 3i Atlas is back in the spotlight, exhibiting strange behavior that has scientists puzzled. With non-gravitational acceleration and focused jets forming an anti-tail, its upcoming close approach to Earth on December 19th has prompted coordinated space defense drills among various nations, raising intriguing questions about its true nature.
SOHO's 30th Anniversary: Celebrating 30 years of operation, the Solar and Heliospheric Observatory (SOHO) has not only revolutionized solar science but has also discovered over 5000 comets, making it the most prolific comet hunter in history. Its resilience and contributions to understanding space weather have been invaluable.
AI in Spacecraft Propulsion: Artificial intelligence is fundamentally transforming spacecraft propulsion systems. Through reinforcement learning, AI is optimizing engine performance in real-time, particularly in complex systems like nuclear thermal propulsion and fusion research, paving the way for more efficient travel across the solar system.
Hypersonic Space Gun: Longshot Space Technologies is developing a hypersonic space gun, a kinetic launch system designed to fire payloads into orbit at Mach 23. This innovative approach could dramatically reduce launch costs and revolutionize space logistics, although it is limited to ruggedized cargo.
Geminid Meteor Shower Preview: The Geminid meteor shower is set to peak on December 13th, offering ideal viewing conditions with a waning crescent moon. Stargazers can expect to see between 120 and 150 meteors per hour, with the chance to witness the colorful streaks originating from the asteroid 3200 Phaethon.
Voyager 2's Uranus Mystery Solved: A decades-old mystery regarding Voyager 2's observations of Uranus has been revisited. New research suggests that the intense radiation belt detected during its flyby in 1986 was influenced by a solar wind structure, confirming a temporary solar storm effect far out in the solar system.
For more cosmic updates, visit our website at astronomydaily.io (http://www.astronomydaily.io/). Join our community on social media by searching for #AstroDailyPod on Facebook, X, YouTubeMusic, 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 Avery and Anna signing off. Until next time, keep looking up and exploring the wonders of our universe.
✍️ Episode References
3i Atlas Observations
[NASA]( https://www.nasa.gov/ (https://www.nasa.gov/) )
SOHO Achievements
[ESA SOHO]( https://soho.nascom.nasa.gov/ (https://soho.nascom.nasa.gov/) )
AI in Propulsion Research
[Journal of Propulsion and Power]( https://arc.aiaa.org/loi/jpp (https://arc.aiaa.org/loi/jpp) )
Hypersonic Launch System
[Longshot Space Technologies]( https://www.longshotspace.com/ (https://www.longshotspace.com/) )
Geminid Meteor Shower
[American Meteor Society]( https://www.amsmeteors.org/ (https://www.amsmeteors.org/) )
Voyager 2 Uranus Findings
[Southwest Research Institute]( https://www.southwestresearchinstitute.org/ (https://www.southwestresearchinstitute.org/) )
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Episode link: https://play.headliner.app/episode/30514362?utm_source=youtube
00:00:00 --> 00:00:03 Welcome to Astronomy Daily, the podcast
00:00:03 --> 00:00:05 that brings you the biggest news from
00:00:05 --> 00:00:07 across the cosmos. I'm Avery.
00:00:07 --> 00:00:10 >> And I'm Anna. We have a fascinating show
00:00:10 --> 00:00:13 for you today. We'll be looking at our
00:00:13 --> 00:00:15 mysterious interstellar object friend
00:00:15 --> 00:00:18 that's prompting secret space drills.
00:00:18 --> 00:00:20 >> We're also celebrating the 30th
00:00:20 --> 00:00:22 anniversary of a legendary solar
00:00:22 --> 00:00:26 observatory and diving into how AI is
00:00:26 --> 00:00:29 revolutionizing spacecraft propulsion.
00:00:29 --> 00:00:32 Plus, a hypersonic space gun, a preview
00:00:32 --> 00:00:35 of one of the best meteor showers of the
00:00:35 --> 00:00:37 year, and we'll solve a decad's old
00:00:37 --> 00:00:40 mystery from Voyager 2's journey to
00:00:40 --> 00:00:41 Uranus.
00:00:41 --> 00:00:43 >> Anna, let's start with something that
00:00:43 --> 00:00:46 has the astronomical community buzzing.
00:00:46 --> 00:00:49 The interstellar object known as threey
00:00:49 --> 00:00:51 Atlas is back in the spotlight.
00:00:51 --> 00:00:54 >> It certainly is, Avery. This object
00:00:54 --> 00:00:57 which came from outside our solar system
00:00:57 --> 00:00:59 is exhibiting some very strange
00:00:59 --> 00:01:01 behavior. Scientists have noted what
00:01:02 --> 00:01:04 they call non-gravitational
00:01:04 --> 00:01:05 acceleration.
00:01:05 --> 00:01:07 >> Meaning it's changing speed in a way
00:01:08 --> 00:01:10 that can't be explained by the pole of
00:01:10 --> 00:01:11 the sun or planets.
00:01:12 --> 00:01:14 >> Exactly. And it's not outgassing like a
00:01:14 --> 00:01:17 typical comet. Instead, it seems to have
00:01:17 --> 00:01:21 these strange focused jets pointing away
00:01:21 --> 00:01:25 from the sun, forming an anti-tail. It's
00:01:25 --> 00:01:26 a real puzzle.
00:01:26 --> 00:01:28 >> And this puzzle is getting some serious
00:01:28 --> 00:01:31 attention. There have been a series of
00:01:31 --> 00:01:34 coordinated but very quiet space defense
00:01:34 --> 00:01:38 drills involving the ESA, Japan, the US,
00:01:38 --> 00:01:41 Australia, and several other nations.
00:01:41 --> 00:01:43 >> That's right. The official line is that
00:01:43 --> 00:01:45 they are standard preparedness
00:01:45 --> 00:01:48 exercises, but the timing is
00:01:48 --> 00:01:50 conspicuous, especially with ThreeI
00:01:50 --> 00:01:53 Atlas's closest approach to Earth
00:01:53 --> 00:01:55 happening on December 19th.
00:01:55 --> 00:01:58 >> It adds a layer of intrigue, especially
00:01:58 --> 00:02:00 when you consider some of the more out
00:02:00 --> 00:02:01 there theories.
00:02:02 --> 00:02:04 >> You're thinking of Aviab's hypothesis.
00:02:04 --> 00:02:07 >> I am. He suggested that threeey atlas
00:02:08 --> 00:02:10 might not be a single object but a
00:02:10 --> 00:02:13 primary craft accompanied by a swarm of
00:02:13 --> 00:02:15 smaller probes. Now that is pure
00:02:16 --> 00:02:17 speculation of course.
00:02:17 --> 00:02:20 >> Pure speculation but it highlights just
00:02:20 --> 00:02:22 how little we understand about this
00:02:22 --> 00:02:25 visitor. Whatever its nature, its
00:02:25 --> 00:02:27 strange dynamics and the heightened
00:02:27 --> 00:02:30 military interest mean that countless
00:02:30 --> 00:02:33 telescopes will be tracking it very,
00:02:33 --> 00:02:35 very closely in the coming weeks.
00:02:35 --> 00:02:38 >> Well, from a mysterious newcomer to a
00:02:38 --> 00:02:41 celebrated veteran, our next story is
00:02:41 --> 00:02:44 about a truly remarkable achievement.
00:02:44 --> 00:02:47 Happy 30th anniversary to the Solar and
00:02:47 --> 00:02:51 Heliospheric Observatory, or SOHO. An
00:02:51 --> 00:02:54 incredible milestone. When SOHO
00:02:54 --> 00:02:56 launched, its primary mission was
00:02:56 --> 00:02:58 scheduled to last just two years. 30
00:02:58 --> 00:03:01 years later, it's still providing
00:03:01 --> 00:03:03 invaluable data about our star.
00:03:03 --> 00:03:05 >> It really is the definition of
00:03:05 --> 00:03:07 resilience. It survived multiple
00:03:07 --> 00:03:10 technical crises that nearly ended the
00:03:10 --> 00:03:12 mission. Yet, the team on the ground
00:03:12 --> 00:03:14 always found a way to bring it back
00:03:14 --> 00:03:15 online.
00:03:15 --> 00:03:18 >> Right. And its contributions have been
00:03:18 --> 00:03:20 monumental. SOHO completely
00:03:20 --> 00:03:23 revolutionized solar science and our
00:03:23 --> 00:03:25 understanding of space weather. The
00:03:25 --> 00:03:28 images and data it provides are the
00:03:28 --> 00:03:31 foundation of modern solar forecasting,
00:03:31 --> 00:03:33 which is critical for protecting our
00:03:33 --> 00:03:35 satellites and power grids.
00:03:35 --> 00:03:37 >> Absolutely. But it has another
00:03:37 --> 00:03:40 completely unexpected legacy, doesn't
00:03:40 --> 00:03:42 it? For a satellite designed to look at
00:03:42 --> 00:03:45 the sun, it's found an incredible number
00:03:45 --> 00:03:48 of comets. It's the most prolific comet
00:03:48 --> 00:03:50 hunter in history, and it's not even
00:03:50 --> 00:03:51 close.
00:03:51 --> 00:03:53 >> Is it a case of being in the right place
00:03:53 --> 00:03:55 at the right time, or is there another
00:03:55 --> 00:03:57 reason why it's so prolific?
00:03:57 --> 00:03:59 >> It's because of its wide, uninterrupted
00:03:59 --> 00:04:02 view of the sun's corona. It spots
00:04:02 --> 00:04:05 so-called sungrazing comets that are
00:04:05 --> 00:04:07 otherwise invisible to us. As of this
00:04:08 --> 00:04:11 year, the official count is over 5
00:04:11 --> 00:04:13 comets discovered by SOHO.
00:04:13 --> 00:04:16 >> That's just amazing. 5 comments as a
00:04:16 --> 00:04:19 side project. SOHO is a true workhorse
00:04:19 --> 00:04:22 of space exploration and a testament to
00:04:22 --> 00:04:24 brilliant engineering.
00:04:24 --> 00:04:26 >> Speaking of brilliant engineering, our
00:04:26 --> 00:04:28 next story looks at the future of
00:04:28 --> 00:04:31 getting around the solar system. Avery,
00:04:31 --> 00:04:34 artificial intelligence is starting to
00:04:34 --> 00:04:36 fundamentally change how we design and
00:04:36 --> 00:04:39 operate spacecraft propulsion systems.
00:04:39 --> 00:04:41 >> This is fascinating stuff. It's not just
00:04:41 --> 00:04:44 about AI pilots like in the movies. This
00:04:44 --> 00:04:46 is about AI making the engines
00:04:46 --> 00:04:49 themselves smarter and more efficient.
00:04:49 --> 00:04:52 >> That's the core of it. Researchers are
00:04:52 --> 00:04:54 using a technique called reinforcement
00:04:54 --> 00:04:57 learning where an AI runs millions of
00:04:57 --> 00:04:59 simulations to discover the most
00:04:59 --> 00:05:01 efficient ways to operate an engine,
00:05:01 --> 00:05:03 often finding solutions that a human
00:05:04 --> 00:05:07 engineer might never think of.
00:05:07 --> 00:05:09 >> So, what kind of advanced systems are
00:05:09 --> 00:05:11 benefiting from this?
00:05:11 --> 00:05:13 We're seeing it applied to next
00:05:13 --> 00:05:16 generation concepts like nuclear thermal
00:05:16 --> 00:05:18 propulsion, both fision and the more
00:05:18 --> 00:05:21 complex fusionbased designs. These
00:05:21 --> 00:05:24 engines are incredibly powerful, but
00:05:24 --> 00:05:27 also incredibly complex to manage.
00:05:28 --> 00:05:30 >> So just what can AI help with? A lot, I
00:05:30 --> 00:05:31 would imagine.
00:05:31 --> 00:05:34 >> AI can optimize the fuel flow,
00:05:34 --> 00:05:37 temperature, and thrust in real time.
00:05:37 --> 00:05:39 It's also being used to tackle one of
00:05:39 --> 00:05:41 the biggest challenges in fusion
00:05:41 --> 00:05:44 research, managing the superheated
00:05:44 --> 00:05:47 plasma. In concepts like the poly well,
00:05:47 --> 00:05:50 a compact fusion device, AI is learning
00:05:50 --> 00:05:52 how to best configure the magnetic
00:05:52 --> 00:05:55 fields to confine the plasma, which is a
00:05:55 --> 00:05:57 massive step forward.
00:05:57 --> 00:06:00 >> So AI is becoming a design partner. It's
00:06:00 --> 00:06:02 not just running the machine, it's
00:06:02 --> 00:06:04 helping to perfect the machine's very
00:06:04 --> 00:06:06 operation. This could be the key to
00:06:06 --> 00:06:08 unlocking faster, more efficient travel
00:06:08 --> 00:06:10 across the solar system.
00:06:10 --> 00:06:12 >> We'll keep an eye on this and report
00:06:12 --> 00:06:15 back on any developments, but it sounds
00:06:15 --> 00:06:16 exciting.
00:06:16 --> 00:06:19 >> From the digital frontier of AI, we go
00:06:19 --> 00:06:22 to something that sounds decidedly more
00:06:22 --> 00:06:26 analog. Anna, what is a hypersonic space
00:06:26 --> 00:06:27 gun?
00:06:27 --> 00:06:29 >> It sounds like something out of Jules
00:06:29 --> 00:06:31 Vern novel, doesn't it? But it's a very
00:06:32 --> 00:06:34 real concept being developed by a
00:06:34 --> 00:06:35 company called Longshot Space
00:06:35 --> 00:06:38 Technologies. They are building a
00:06:38 --> 00:06:41 kinetic space launch system. In simple
00:06:41 --> 00:06:44 terms, it's a massive gun designed to
00:06:44 --> 00:06:47 fire payloads directly into orbit.
00:06:47 --> 00:06:50 >> You're kidding. How does that even work?
00:06:50 --> 00:06:53 >> The system uses a huge piston driven by
00:06:53 --> 00:06:56 compressed gas to launch a projectile at
00:06:56 --> 00:07:00 incredible speeds. We're talking Mach 23
00:07:00 --> 00:07:03 or about 28
00:07:03 --> 00:07:07 km hour. The projectile would carry a
00:07:07 --> 00:07:10 small hardened satellite or other cargo.
00:07:10 --> 00:07:13 >> I can't even imagine the forces
00:07:13 --> 00:07:15 involved. The heat and the acceleration
00:07:15 --> 00:07:17 must be astronomical.
00:07:17 --> 00:07:20 >> They are. That's the biggest challenge.
00:07:20 --> 00:07:22 The payload would experience about
00:07:22 --> 00:07:26 10 gs of acceleration and intense
00:07:26 --> 00:07:29 atmospheric heating. So this isn't for
00:07:29 --> 00:07:31 launching astronauts or delicate
00:07:31 --> 00:07:33 telescopes.
00:07:33 --> 00:07:35 >> Definitely not. So it's for hardened
00:07:36 --> 00:07:37 cargo only.
00:07:37 --> 00:07:40 >> Exactly. Things like fuel, water,
00:07:40 --> 00:07:42 building materials, or ruggedized
00:07:42 --> 00:07:44 military satellites. But here's the
00:07:44 --> 00:07:47 payoff. Longot believes they can get the
00:07:47 --> 00:07:50 cost of launching a kilogram of cargo to
00:07:50 --> 00:07:52 just $10.
00:07:52 --> 00:07:54 >> $10. That's compared to thousands of
00:07:54 --> 00:07:56 dollars per kilogram on a traditional
00:07:56 --> 00:07:59 rocket. That's a complete gamecher for
00:07:59 --> 00:08:00 space logistics.
00:08:00 --> 00:08:03 >> It is. And that's why it's attracting
00:08:03 --> 00:08:05 serious interest from both venture
00:08:05 --> 00:08:08 capital and military agencies. If they
00:08:08 --> 00:08:10 can solve the engineering challenges,
00:08:10 --> 00:08:13 this space gun could revolutionize how
00:08:13 --> 00:08:16 we supply future operations in orbit and
00:08:16 --> 00:08:17 beyond.
00:08:17 --> 00:08:19 >> All right, let's bring our focus back to
00:08:19 --> 00:08:21 our own night sky. For all our
00:08:21 --> 00:08:23 stargazing listeners out there, one of
00:08:23 --> 00:08:25 the best celestial shows of the year is
00:08:25 --> 00:08:27 just around the corner.
00:08:27 --> 00:08:30 >> That's right. The Gemini meteor shower
00:08:30 --> 00:08:32 is set to peak on the night of December
00:08:32 --> 00:08:35 13th into the morning of the 14th. And
00:08:35 --> 00:08:37 this year, the conditions are just about
00:08:37 --> 00:08:39 perfect.
00:08:39 --> 00:08:41 >> What makes this year so good?
00:08:41 --> 00:08:44 >> The moon. It will be a waning crescent,
00:08:44 --> 00:08:46 which means it won't rise until the
00:08:46 --> 00:08:48 early hours of the morning, and its
00:08:48 --> 00:08:50 light won't wash out the fainter
00:08:50 --> 00:08:52 meteors. We'll have beautifully dark
00:08:52 --> 00:08:54 skies for most of the night.
00:08:54 --> 00:08:57 >> Fantastic. So, what can people expect to
00:08:57 --> 00:08:59 see?
00:08:59 --> 00:09:01 >> Under ideal conditions, you could see
00:09:01 --> 00:09:05 between 120 and 150 meteors per hour at
00:09:05 --> 00:09:08 the peak. The radiant, the point they
00:09:08 --> 00:09:10 appear to come from, is near the star
00:09:10 --> 00:09:14 castor in the constellation Gemini.
00:09:14 --> 00:09:16 >> And Geminites are known for being a bit
00:09:16 --> 00:09:18 slower, right? It makes them easier to
00:09:18 --> 00:09:19 spot.
00:09:19 --> 00:09:22 >> Yes, they enter the atmosphere at about
00:09:22 --> 00:09:25 22 m per second. That sounds fast, but
00:09:25 --> 00:09:27 it's slower than many other showers,
00:09:27 --> 00:09:30 which can lead to longer, more graceful
00:09:30 --> 00:09:33 streaks across the sky. They are also
00:09:33 --> 00:09:34 often brightly colored
00:09:34 --> 00:09:36 >> and they have a really interesting
00:09:36 --> 00:09:37 origin.
00:09:37 --> 00:09:39 >> They do. Unlike most meteor showers
00:09:40 --> 00:09:42 which come from the debris trail of a
00:09:42 --> 00:09:44 comet, the Geminids originate from an
00:09:44 --> 00:09:48 asteroid called 3200 Faithon. It's a bit
00:09:48 --> 00:09:50 of a mystery how this rocky body
00:09:50 --> 00:09:52 produces so much debris.
00:09:52 --> 00:09:54 >> So what are your tips for viewers?
00:09:54 --> 00:09:57 >> Find a location away from city lights.
00:09:57 --> 00:10:00 Dress warmly, lie back on a blanket or a
00:10:00 --> 00:10:03 chair, and just look up. You don't need
00:10:03 --> 00:10:06 a telescope or binoculars. Just give
00:10:06 --> 00:10:08 your eyes about 20 minutes to fully
00:10:08 --> 00:10:11 adapt to the dark and enjoy the show.
00:10:11 --> 00:10:13 And for our final story today, we are
00:10:13 --> 00:10:15 revisiting a cold case from the outer
00:10:15 --> 00:10:18 solar system and solving a mystery
00:10:18 --> 00:10:20 that's nearly four decades old.
00:10:20 --> 00:10:23 >> This has to be about Voyager 2's flyby
00:10:23 --> 00:10:26 of Uranus in 1986. I remember reading
00:10:26 --> 00:10:29 that it found something unexpected in
00:10:29 --> 00:10:31 the planet's radiation belts.
00:10:31 --> 00:10:33 >> That's the one. Voyager 2 detected an
00:10:34 --> 00:10:36 incredibly intense belt of high energy
00:10:36 --> 00:10:39 electron radiation, far more powerful
00:10:39 --> 00:10:42 than models had predicted. For decades,
00:10:42 --> 00:10:44 scientists couldn't quite explain why it
00:10:44 --> 00:10:45 was so strong.
00:10:45 --> 00:10:48 >> And after all this time, there's a new
00:10:48 --> 00:10:48 explanation.
00:10:48 --> 00:10:51 >> There is. A team at the Southwest
00:10:51 --> 00:10:53 Research Institute revisited the old
00:10:54 --> 00:10:56 Voyager data. They proposed the intense
00:10:56 --> 00:10:59 radiation wasn't caused by Uranus alone.
00:10:59 --> 00:11:02 Instead, it was a case of being in the
00:11:02 --> 00:11:04 right place at the right time.
00:11:04 --> 00:11:05 >> So, what was happening?
00:11:06 --> 00:11:08 >> The team believes a huge structure in
00:11:08 --> 00:11:10 the solar wind called a co-rotating
00:11:10 --> 00:11:13 interaction region was passing through
00:11:13 --> 00:11:16 the Uranian system just as Voyager 2
00:11:16 --> 00:11:17 flew by.
00:11:17 --> 00:11:19 >> A co-rotating what? Now,
00:11:19 --> 00:11:21 >> think of it as a massive shock wave in
00:11:21 --> 00:11:23 the solar wind where fast moving solar
00:11:23 --> 00:11:26 particles overtake slower ones. This
00:11:26 --> 00:11:28 interaction creates powerful
00:11:28 --> 00:11:30 highfrequency plasma waves like Whistler
00:11:30 --> 00:11:33 waves. These waves were the perfect
00:11:33 --> 00:11:35 frequency to grab electrons already
00:11:35 --> 00:11:37 trapped in Uranus's magnetic field and
00:11:38 --> 00:11:40 accelerate them to incredible speeds,
00:11:40 --> 00:11:42 creating that intense radiation belt
00:11:42 --> 00:11:45 Voyager saw. We see similar events
00:11:45 --> 00:11:48 happen near Earth, but this is the first
00:11:48 --> 00:11:50 time we've confirmed it happening so far
00:11:50 --> 00:11:51 out in the solar system.
00:11:51 --> 00:11:54 >> So, it was a temporary storm caused by
00:11:54 --> 00:11:56 the sun that Voyager just happened to
00:11:56 --> 00:11:59 fly through. That is a brilliant piece
00:11:59 --> 00:12:01 of cosmic detective work.
00:12:01 --> 00:12:01 >> You betcha.
00:12:01 --> 00:12:04 >> And that's a wrap. From mysterious
00:12:04 --> 00:12:06 interstellar visitors and hypersonic
00:12:06 --> 00:12:08 cannons to celebrating a 30-year-old
00:12:08 --> 00:12:12 hero of astronomy and finally solving a
00:12:12 --> 00:12:14 cold case from Uranus. What an episode.
00:12:14 --> 00:12:17 >> It really was. That's all the time we
00:12:17 --> 00:12:19 have for today on Astronomy Daily. We'd
00:12:19 --> 00:12:21 like to thank you all for tuning in.
00:12:21 --> 00:12:23 >> Join us next time as we continue to
00:12:23 --> 00:12:25 explore the wonders of the universe.
00:12:25 --> 00:12:28 Until then, clear skies everyone and
00:12:28 --> 00:12:31 remember to get out there and look up.
00:12:31 --> 00:12:34 Every day
00:12:34 --> 00:12:42 stories we told
00:12:42 --> 00:12:50 stories told
00:12:50 --> 00:12:52 stories