- 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. 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.
3i Atlas Observations
[NASA](https://www.nasa.gov/)
SOHO Achievements
[ESA SOHO](https://soho.nascom.nasa.gov/)
AI in Propulsion Research
[Journal of Propulsion and Power](https://arc.aiaa.org/loi/jpp)
Hypersonic Launch System
[Longshot Space Technologies](https://www.longshotspace.com/)
Geminid Meteor Shower
[American Meteor Society](https://www.amsmeteors.org/)
Voyager 2 Uranus Findings
[Southwest Research Institute](https://www.southwestresearchinstitute.org/)
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This episode includes AI-generated content.
00:00:00 --> 00:00:03 Avery: Welcome to Astronomy Daily, the podcast that
00:00:03 --> 00:00:05 brings you the biggest news from across the
00:00:05 --> 00:00:07 cosmos. I'm Avery.
00:00:07 --> 00:00:10 Anna: And I'm Anna. We have a fascinating
00:00:10 --> 00:00:13 show 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 --> 00:00:21 Avery: We're also celebrating the 30th anniversary
00:00:21 --> 00:00:24 of a legendary solar observatory. And
00:00:24 --> 00:00:26 diving into how AI is
00:00:26 --> 00:00:28 revolutionizing spacecraft propulsion.
00:00:29 --> 00:00:31 Anna: Plus a hypersonic space gun.
00:00:32 --> 00:00:34 Preview of one of the best meteor showers of
00:00:34 --> 00:00:37 the year. And we'll solve a decades old
00:00:37 --> 00:00:40 mystery from Voyager 2's journey to
00:00:40 --> 00:00:40 Uranus.
00:00:41 --> 00:00:41 Avery: Anna.
00:00:41 --> 00:00:43 Uh, let's start with something that has the
00:00:43 --> 00:00:46 astronomical community buzzing. The
00:00:46 --> 00:00:49 interstellar object known as 3i
00:00:49 --> 00:00:51 Atlas is back in the spotlight.
00:00:51 --> 00:00:54 Anna: It certainly is, Avery. This object,
00:00:54 --> 00:00:56 which came from outside our solar system,
00:00:57 --> 00:01:00 is exhibiting some very strange behavior.
00:01:00 --> 00:01:03 Scientists have noted what they call non
00:01:03 --> 00:01:04 gravitational acceleration.
00:01:05 --> 00:01:08 Avery: Meaning it's changing speed in a way that
00:01:08 --> 00:01:10 can't be explained by the pull of the sun or
00:01:10 --> 00:01:11 planets.
00:01:11 --> 00:01:14 Anna: Exactly. And it's not outgassing like
00:01:14 --> 00:01:17 a typical comet. Instead, it seems to
00:01:17 --> 00:01:19 have these strange focused jets
00:01:20 --> 00:01:23 pointing away from the sun, forming an
00:01:23 --> 00:01:25 anti tail. It's a real puzzle.
00:01:26 --> 00:01:28 Avery: 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 --> 00:01:36 drills involving the ESA,
00:01:36 --> 00:01:39 Japan, the U.S. australia and
00:01:39 --> 00:01:40 several other nations.
00:01:40 --> 00:01:43 Anna: That's right. The official line is that they
00:01:43 --> 00:01:45 are standard preparedness exercises. Uh,
00:01:46 --> 00:01:49 but the timing is conspicuous, especially
00:01:49 --> 00:01:52 with 3i atlas. Closest approach to
00:01:52 --> 00:01:55 Earth happening on December 19th.
00:01:55 --> 00:01:58 Avery: It adds a layer of intrigue, especially
00:01:58 --> 00:02:00 when you consider some of the more out there
00:02:00 --> 00:02:01 theories.
00:02:01 --> 00:02:04 Anna: You're thinking of Avi Loeb's hypothesis.
00:02:04 --> 00:02:07 Avery: I am. He suggested that 3i
00:02:07 --> 00:02:09 Atlas might not be a single object, but
00:02:09 --> 00:02:12 a primary craft accompanied by a
00:02:12 --> 00:02:15 swarm of smaller probes. Now that is
00:02:15 --> 00:02:17 pure speculation, of course.
00:02:17 --> 00:02:20 Anna: Pure speculation. But it highlights
00:02:20 --> 00:02:22 just how little we understand about this
00:02:22 --> 00:02:25 visitor. Whatever its nature, its
00:02:25 --> 00:02:28 strange dynamics and the heightened military
00:02:28 --> 00:02:31 interest mean that countless telescopes
00:02:31 --> 00:02:34 will be tracking it very, very closely
00:02:34 --> 00:02:35 in the coming weeks.
00:02:35 --> 00:02:38 Avery: Well, from a mysterious newcomer to a
00:02:38 --> 00:02:41 celebrated veteran, our next story is
00:02:41 --> 00:02:43 about a truly remarkable achievement.
00:02:44 --> 00:02:46 Happy 30th anniversary to the
00:02:46 --> 00:02:49 Solar and Heliospheric Observatory,
00:02:49 --> 00:02:50 or SOHO.
00:02:51 --> 00:02:54 Anna: An incredible milestone. When SOHO
00:02:54 --> 00:02:56 launched, its primary mission was scheduled
00:02:56 --> 00:02:59 to last just two years. Thirty years
00:02:59 --> 00:03:02 later, it's still providing invaluable data
00:03:02 --> 00:03:03 about our star.
00:03:03 --> 00:03:05 Avery: It really is the definition of resilience.
00:03:06 --> 00:03:08 It survived multiple technical crises
00:03:08 --> 00:03:11 that nearly ended the mission. Yet the team
00:03:11 --> 00:03:14 on the ground always found a way to bring it
00:03:14 --> 00:03:14 back online.
00:03:15 --> 00:03:17 Anna: Right. And its contributions have been
00:03:17 --> 00:03:20 monumental. SoHo completely
00:03:20 --> 00:03:23 revolutionized solar science and our
00:03:23 --> 00:03:26 understanding of space weather. The images
00:03:26 --> 00:03:28 and data it provides are the foundation
00:03:28 --> 00:03:31 of modern solar forecasting, which is
00:03:31 --> 00:03:34 critical for protecting our satellites and
00:03:34 --> 00:03:34 power grids.
00:03:35 --> 00:03:37 Avery: Absolutely. But it has another
00:03:37 --> 00:03:40 completely unexpected legacy, doesn't it?
00:03:40 --> 00:03:43 For a satellite designed to look at the sun,
00:03:43 --> 00:03:45 it's found an incredible number of comets.
00:03:46 --> 00:03:48 Anna: It's the most prolific comet hunter in
00:03:48 --> 00:03:51 history, and it's not even close to.
00:03:51 --> 00:03:53 Avery: Is it a case of being in the right place at
00:03:53 --> 00:03:55 the right time, or is there another reason
00:03:55 --> 00:03:56 why it's so prolific?
00:03:56 --> 00:03:59 Anna: It's because of its wide, uninterrupted view
00:03:59 --> 00:04:02 of the Sun's corona. It spots so called
00:04:02 --> 00:04:05 sun grazing comets that are otherwise
00:04:05 --> 00:04:08 invisible to us. As of this year, the
00:04:08 --> 00:04:10 official count is over 5000
00:04:11 --> 00:04:12 comets discovered by SOHO.
00:04:13 --> 00:04:15 Avery: That's just amazing. 5000
00:04:15 --> 00:04:18 comets as a side project. SOHO is
00:04:18 --> 00:04:21 a true workhorse of space exploration and a
00:04:21 --> 00:04:23 testament to brilliant engineering.
00:04:24 --> 00:04:26 Anna: Speaking of brilliant engineering, our next
00:04:26 --> 00:04:29 story looks at the future of getting around
00:04:29 --> 00:04:31 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 --> 00:04:38 operate spacecraft propulsion systems.
00:04:39 --> 00:04:41 Avery: 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 --> 00:04:47 is about AI making the engines themselves
00:04:47 --> 00:04:48 smarter and more efficient.
00:04:49 --> 00:04:52 Anna: That's the core of it. Researchers are using
00:04:52 --> 00:04:54 a technique called reinforcement learning,
00:04:54 --> 00:04:57 where an AI runs millions of simulations
00:04:57 --> 00:05:00 to discover, uh, the most efficient ways to
00:05:00 --> 00:05:03 operate an engine, often finding solutions
00:05:03 --> 00:05:06 that a human engineer might never think of.
00:05:07 --> 00:05:09 Avery: So what kind of advanced systems are
00:05:09 --> 00:05:10 benefiting from this?
00:05:11 --> 00:05:13 Anna: We're seeing it applied to next generation
00:05:13 --> 00:05:16 concepts like nuclear thermal propulsion,
00:05:17 --> 00:05:20 both fission and the more complex fusion
00:05:20 --> 00:05:22 based designs. These engines are
00:05:22 --> 00:05:25 incredibly powerful, but also incredibly
00:05:25 --> 00:05:26 complex to manage.
00:05:28 --> 00:05:30 Avery: So just what can AI help with? A lot. I would
00:05:30 --> 00:05:30 imagine.
00:05:31 --> 00:05:34 Anna: AI can optimize the fuel flow,
00:05:34 --> 00:05:36 temperature and thrust in real time.
00:05:37 --> 00:05:39 It's also being used to tackle one of the
00:05:39 --> 00:05:41 biggest challenges in fusion research,
00:05:42 --> 00:05:44 managing the superheated plasma.
00:05:44 --> 00:05:47 In concepts like the polywell, a compact
00:05:47 --> 00:05:50 fusion device, AI is learning how to best
00:05:50 --> 00:05:53 configure the magnetic fields to confine the
00:05:53 --> 00:05:56 plasma, which is a massive step forward.
00:05:57 --> 00:06:00 Avery: So AI is becoming a design partner.
00:06:00 --> 00:06:02 It's 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 unlocking
00:06:06 --> 00:06:09 faster, more efficient travel across the
00:06:09 --> 00:06:09 solar system.
00:06:10 --> 00:06:13 Anna: We'll keep an eye on this and report back on
00:06:13 --> 00:06:15 any developments. But. But it sounds
00:06:15 --> 00:06:15 exciting.
00:06:16 --> 00:06:19 Avery: From the digital frontier of AI, we go
00:06:19 --> 00:06:21 to something that sounds decidedly more
00:06:22 --> 00:06:24 analog. Anna. Uh, what is a
00:06:24 --> 00:06:26 hypersonic space gun?
00:06:26 --> 00:06:29 Anna: It sounds like something out of Jules Verne
00:06:29 --> 00:06:32 novel, doesn't it. But it's a very real
00:06:32 --> 00:06:34 concept being developed by a company called
00:06:34 --> 00:06:37 Longshot Space Technologies. They are
00:06:37 --> 00:06:40 building a kinetic space launch system.
00:06:40 --> 00:06:43 In simple terms, it's a massive grid gun
00:06:43 --> 00:06:46 designed to fire payloads directly into
00:06:46 --> 00:06:46 orbit.
00:06:47 --> 00:06:49 Avery: You're kidding. How does that even work?
00:06:50 --> 00:06:53 Anna: The system uses a huge piston, uh, driven
00:06:53 --> 00:06:55 by compressed gas to launch a
00:06:55 --> 00:06:58 projectile at incredible speeds. We're
00:06:58 --> 00:07:01 talking Mach 23, or about
00:07:01 --> 00:07:04 28 kilometers per
00:07:04 --> 00:07:07 hour. The projectile would carry a small
00:07:07 --> 00:07:09 hardened satellite or other cargo.
00:07:10 --> 00:07:13 Avery: I can't even imagine the forces
00:07:13 --> 00:07:15 involved. The heat and the acceleration must
00:07:15 --> 00:07:16 be astronomical.
00:07:17 --> 00:07:20 Anna: They are. That's the biggest challenge. The
00:07:20 --> 00:07:23 payload would experience about 10
00:07:23 --> 00:07:26 GS of acceleration and intense
00:07:26 --> 00:07:29 atmospheric heating. So this isn't
00:07:29 --> 00:07:31 for launching astronauts or delicate
00:07:31 --> 00:07:32 telescopes?
00:07:33 --> 00:07:35 Avery: Definitely not. So it's for hardened
00:07:35 --> 00:07:36 cargo only.
00:07:37 --> 00:07:39 Anna: Exactly. Things like fuel, water,
00:07:40 --> 00:07:42 building materials, or ruggedized military
00:07:42 --> 00:07:45 satellites. But here's the payoff.
00:07:45 --> 00:07:47 Longshot believes they can get the cost of
00:07:47 --> 00:07:50 launching a kilogram of Cargo to just
00:07:50 --> 00:07:51 $10.
00:07:51 --> 00:07:54 Avery: $10? That's compared to thousands of
00:07:54 --> 00:07:56 dollars per kilogram on a traditional rocket.
00:07:57 --> 00:07:59 That's a complete game changer for space
00:07:59 --> 00:08:00 logistics.
00:08:00 --> 00:08:02 Anna: It is, and that's why it's attracting
00:08:02 --> 00:08:05 serious interest from both venture capital
00:08:05 --> 00:08:08 and military agencies. If they
00:08:09 --> 00:08:11 engineering challenges, this space gun
00:08:11 --> 00:08:14 could revolutionize how we supply future
00:08:14 --> 00:08:16 operations in orbit and beyond.
00:08:17 --> 00:08:19 Avery: All right, let's bring our focus back to our
00:08:19 --> 00:08:21 own night sky. For all our stargazing
00:08:21 --> 00:08:23 listeners out there, one of the best
00:08:23 --> 00:08:26 celestial shows of the year is just around
00:08:26 --> 00:08:26 the corner.
00:08:27 --> 00:08:30 Anna: That's right. The Gemini meteor shower is set
00:08:30 --> 00:08:33 to peak on the night of December 13th into
00:08:33 --> 00:08:36 the morning of the 14th. And this year,
00:08:36 --> 00:08:38 the conditions are just about perfect.
00:08:39 --> 00:08:40 Avery: What makes this year so good?
00:08:41 --> 00:08:44 Anna: The moon. It will be a waning crescent,
00:08:44 --> 00:08:46 which means it won't rise until the early
00:08:46 --> 00:08:49 hours of the morning. And its light won't
00:08:49 --> 00:08:51 wash out the fainter meteors. We'll have
00:08:51 --> 00:08:54 beautifully dark skies for most of the night.
00:08:54 --> 00:08:57 Avery: Fantastic. So what can people expect to
00:08:57 --> 00:08:58 see?
00:08:58 --> 00:09:01 Anna: Under ideal conditions, you could see between
00:09:01 --> 00:09:04 120 and 150 meteors
00:09:04 --> 00:09:07 per hour at the peak. The radiant, the
00:09:07 --> 00:09:10 point they appear to come from is near the
00:09:10 --> 00:09:12 the star Castor in the constellation
00:09:12 --> 00:09:13 Gemini.
00:09:13 --> 00:09:16 Avery: And Geminites are known for being a bit
00:09:16 --> 00:09:16 slower.
00:09:16 --> 00:09:17 Anna: Right.
00:09:17 --> 00:09:18 Avery: It makes them easier to spot.
00:09:19 --> 00:09:22 Anna: Yes. They enter the atmosphere at about
00:09:22 --> 00:09:24 22 miles per second. That
00:09:24 --> 00:09:27 sounds fast. But it's slower than many other
00:09:27 --> 00:09:29 showers, which can lead to longer, more
00:09:29 --> 00:09:32 graceful streaks across the sky. They are
00:09:32 --> 00:09:34 also often brightly colored, and.
00:09:34 --> 00:09:36 Avery: Um, they have a really interesting origin.
00:09:36 --> 00:09:39 Anna: They do. Unlike Most meteor showers,
00:09:39 --> 00:09:42 which come from the debris trail of a comet.
00:09:42 --> 00:09:45 The Geminids originate from an asteroid
00:09:45 --> 00:09:48 called 3200 Phaethon. It's a
00:09:48 --> 00:09:51 bit of a mystery how this rocky body produces
00:09:51 --> 00:09:52 so much debris.
00:09:52 --> 00:09:54 Avery: So what are your tips for viewers?
00:09:54 --> 00:09:57 Anna: Find a location away from city lights,
00:09:57 --> 00:10:00 dress warmly, lie back on a blanket
00:10:00 --> 00:10:03 or a chair and just look up. You
00:10:03 --> 00:10:05 don't need a telescope or binoculars.
00:10:05 --> 00:10:08 Just give 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 --> 00:10:16 revisiting a cold case from the outer solar
00:10:16 --> 00:10:19 system and solving a mystery that's nearly
00:10:19 --> 00:10:20 four decades old.
00:10:20 --> 00:10:23 Avery: This has to be about Voyager 2's flyby of
00:10:23 --> 00:10:25 Uranus in 1986. I remember
00:10:26 --> 00:10:29 reading that it found something unexpected in
00:10:29 --> 00:10:30 the planet's radiation belts.
00:10:30 --> 00:10:33 Anna: That's the 1. Voyager 2 detected an
00:10:33 --> 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 was
00:10:44 --> 00:10:45 so strong.
00:10:45 --> 00:10:47 Avery: And after all this time, there's a new
00:10:47 --> 00:10:48 explanation.
00:10:48 --> 00:10:51 Anna: There is? A team at the Southwest Research
00:10:51 --> 00:10:54 Institute revisited the old Voyager data.
00:10:55 --> 00:10:57 They proposed the intense radiation wasn't
00:10:57 --> 00:11:00 caused by Uranus alone. Instead,
00:11:00 --> 00:11:03 it was a case of being in the right place at
00:11:03 --> 00:11:04 the right time.
00:11:04 --> 00:11:05 Avery: So what was happening?
00:11:05 --> 00:11:08 Anna: The team believes a huge structure in the
00:11:08 --> 00:11:10 solar wind called a uh CO rotating
00:11:10 --> 00:11:13 interaction region was passing through the
00:11:13 --> 00:11:16 Uranian system just as Voyager 2
00:11:16 --> 00:11:16 flew by.
00:11:16 --> 00:11:19 Avery: A uh co rotating what now?
00:11:19 --> 00:11:21 Anna: Think of it as a massive shockwave in the
00:11:21 --> 00:11:24 solar wind where fast moving solar particles
00:11:24 --> 00:11:26 overtake slower ones. This interaction
00:11:26 --> 00:11:29 creates powerful high frequency plasma waves
00:11:29 --> 00:11:32 like Whistler waves. These waves were the
00:11:32 --> 00:11:35 perfect frequency to grab electrons already
00:11:35 --> 00:11:37 trapped in Uranus's magnetic field and
00:11:37 --> 00:11:40 accelerate them to incredible speeds,
00:11:40 --> 00:11:43 creating that intense radiation belt Voyager
00:11:43 --> 00:11:46 saw. We see similar events happen near
00:11:46 --> 00:11:48 Earth, but this is the first time we've
00:11:48 --> 00:11:50 confirmed it happening so far out in the
00:11:50 --> 00:11:51 solar system.
00:11:51 --> 00:11:54 Avery: So it was a temporary storm caused by the
00:11:54 --> 00:11:57 sun that Voyager just happened to fly
00:11:57 --> 00:11:59 through. That is a brilliant piece of cosmic
00:11:59 --> 00:12:00 detective work.
00:12:00 --> 00:12:01 Anna: You betcha.
00:12:01 --> 00:12:04 Avery: And that's a wrap. From mysterious
00:12:04 --> 00:12:06 interstellar visitors and hypersonic cannons
00:12:06 --> 00:12:09 to celebrating a 30 year old hero of
00:12:09 --> 00:12:12 astronomy. And finally solving a cold
00:12:12 --> 00:12:15 case from Uranus. What an episode it really
00:12:15 --> 00:12:15 was.
00:12:16 --> 00:12:18 Anna: That's all the time we have for today on
00:12:18 --> 00:12:20 Astronomy Daily. We'd like to thank you all
00:12:20 --> 00:12:21 for tuning in.
00:12:21 --> 00:12:24 Avery: Join us next time as we continue to explore
00:12:24 --> 00:12:26 the wonders of the universe. Until then,
00:12:26 --> 00:12:29 clear skies everyone. And remember to get out
00:12:29 --> 00:12:30 there and look up.
00:12:34 --> 00:12:36 Anna: Mhm.
00:12:41 --> 00:12:42 The stories.
00:12:50 --> 00:12:51 Were told.