00:38 – **New study could rewrite our understanding of how stars seed the cosmos
02:04 – **New research suggests 30 hot Jupiters likely formed through disk migration
03:23 – **China has been particularly active with two recent launches
04:12 – **Chinese researchers have identified eight potential karst caves on Mars
05:27 – **The James Webb Space Telescope recently celebrated its fourth anniversary
06:20 – **Iran successfully launched three of its domestically built earth observation satellites
07:11 – **This is the last Astronomy Daily podcast of 2017### Sources & Further Reading1. NASA2. European Space Agency3. Space.com### Follow & ContactX/Twitter: @AstroDailyPod
Instagram: @astrodailypod
Email: hello@astronomydaily.io
Website: astronomydaily.io
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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 universe one story at a time.
00:00:05 --> 00:00:06 I'm Avery.
00:00:06 --> 00:00:09 Anna: And I'm Anna. It's great to have you with us
00:00:09 --> 00:00:12 today. We've got a packed episode. We'll be
00:00:12 --> 00:00:15 looking at how giant stars might be spreading
00:00:15 --> 00:00:17 life's building blocks in a way we never
00:00:17 --> 00:00:18 expected.
00:00:18 --> 00:00:21 Avery: We'll also dive into the mysterious origins
00:00:21 --> 00:00:23 of hot Jupiters, check out some newly
00:00:23 --> 00:00:26 discovered caves on Mars that could be hiding
00:00:26 --> 00:00:28 signs of life, and take a breathtaking tour
00:00:28 --> 00:00:31 of the cosmos, courtesy of the James Webb
00:00:31 --> 00:00:31 Space Telescop.
00:00:32 --> 00:00:34 Anna: Plus a roundup of rocket launches this week,
00:00:34 --> 00:00:37 and a significant step forward for Iran's
00:00:37 --> 00:00:37 space program.
00:00:38 --> 00:00:40 So let's get started with our first story,
00:00:40 --> 00:00:42 which could rewrite our understanding of how
00:00:42 --> 00:00:44 stars seed the cosmos.
00:00:44 --> 00:00:46 Avery: I'm intrigued. What's the latest?
00:00:47 --> 00:00:49 Anna: Well, for a long time, astronomers believed
00:00:49 --> 00:00:51 that the winds from red giant stars were
00:00:51 --> 00:00:54 driven by a simple mechanism. The pressure of
00:00:54 --> 00:00:57 starlight pushing on tiny grains of dust.
00:00:57 --> 00:00:59 Avery: Right. Like a solar sail. But on a
00:00:59 --> 00:01:02 microscopic scale. This process was thought
00:01:02 --> 00:01:04 to be responsible for spreading heavy
00:01:04 --> 00:01:06 elements, like the carbon in our bodies
00:01:06 --> 00:01:07 across the galaxy.
00:01:07 --> 00:01:10 Anna: Exactly. But a, uh, new study focusing on the
00:01:10 --> 00:01:13 red giant star R Doradus is challenging
00:01:13 --> 00:01:15 that entire idea. After careful
00:01:15 --> 00:01:18 observation, researchers found that the dust
00:01:18 --> 00:01:20 grains forming around this star are simply
00:01:20 --> 00:01:21 too small.
00:01:22 --> 00:01:24 Avery: Too small. So the push from the star's
00:01:24 --> 00:01:26 light isn't strong enough to drive the
00:01:26 --> 00:01:28 stellar wind out into space.
00:01:29 --> 00:01:31 Anna: Precisely. The physics just doesn't add up.
00:01:32 --> 00:01:34 This suggests other more powerful forces must
00:01:34 --> 00:01:37 be at play. The study points to possibilities
00:01:37 --> 00:01:40 like giant convective bubbles, similar to
00:01:40 --> 00:01:43 water boiling in a pot, or powerful stellar
00:01:43 --> 00:01:45 pulsations that physically throw material
00:01:45 --> 00:01:45 outwards.
00:01:46 --> 00:01:49 Avery: Wow. So it's less of a gentle push and
00:01:49 --> 00:01:51 more of a cosmic eruption. That's a huge
00:01:51 --> 00:01:52 shift in thinking.
00:01:53 --> 00:01:55 Anna: It is. It means we have to reconsider one of
00:01:55 --> 00:01:58 the fundamental processes of how galaxies are
00:01:58 --> 00:02:00 enriched with the elements necessary for plan
00:02:00 --> 00:02:03 planets and ultimately for life itself.
00:02:04 --> 00:02:06 Avery: From the end of a star's life, let's jump to
00:02:06 --> 00:02:08 the formation of planets. We're talking about
00:02:08 --> 00:02:11 one of the strangest types of exoplanets out
00:02:11 --> 00:02:13 there. The hot Jupiters.
00:02:13 --> 00:02:16 Anna: Mm mhm. These are gas giants, much like our
00:02:16 --> 00:02:18 own Jupiter. But they orbit incredibly close
00:02:18 --> 00:02:21 to their host stars, completing a full year
00:02:21 --> 00:02:24 in just a few Earth days. The big question
00:02:24 --> 00:02:26 has always been, how did they get there?
00:02:27 --> 00:02:29 Avery: One popular theory was called high
00:02:29 --> 00:02:31 eccentricity migration. It's a pretty
00:02:31 --> 00:02:34 chaotic process where a planet gets knocked
00:02:34 --> 00:02:35 around by other objects in the system,
00:02:36 --> 00:02:38 eventually flinging it into a tight, close
00:02:38 --> 00:02:39 orbit.
00:02:39 --> 00:02:42 Anna: It Sounds very violent. But new research
00:02:42 --> 00:02:45 looking at over 500 of these hot Jupiters
00:02:45 --> 00:02:47 suggests a much gentler path for many of
00:02:47 --> 00:02:50 them. The study found that about 30 of these
00:02:50 --> 00:02:52 worlds likely formed through a process called
00:02:52 --> 00:02:53 disk migration.
00:02:54 --> 00:02:56 Avery: Disk migration. So what does that entail? Is
00:02:56 --> 00:02:57 it calmer?
00:02:57 --> 00:03:00 Anna: Much calmer. In this scenario, the planet
00:03:00 --> 00:03:03 forms much farther out in the protoplanetary
00:03:03 --> 00:03:05 disk, that big swirl of gas and dust a star
00:03:05 --> 00:03:08 is born from. And then it slowly spirals
00:03:08 --> 00:03:11 inward, migrating through the disk material
00:03:11 --> 00:03:13 until it settles into a close orbit.
00:03:13 --> 00:03:16 Avery: That makes sense. So it's not always a game
00:03:16 --> 00:03:18 of planetary pinball. This really adds
00:03:18 --> 00:03:20 another important layer to our understanding
00:03:20 --> 00:03:22 of how planetary systems can evolve.
00:03:23 --> 00:03:25 Anna: Now, let's bring our focus a little closer to
00:03:25 --> 00:03:27 home with a quick roundup of recent and
00:03:27 --> 00:03:30 upcoming rocket launches. It's been a busy
00:03:30 --> 00:03:32 period as we close out 2025 and head into
00:03:32 --> 00:03:33 2026.
00:03:34 --> 00:03:37 Avery: Absolutely. China has been particularly
00:03:37 --> 00:03:39 active with two recent launches. A, uh, Chong
00:03:39 --> 00:03:42 Zhang 4B rocket took flight, as did a Chong
00:03:42 --> 00:03:45 Zhang 7AMeanwhile.
00:03:45 --> 00:03:47 Anna: SpaceX has been wrapping up its year. A
00:03:47 --> 00:03:49 Falcon 9 mission successfully deployed the
00:03:49 --> 00:03:52 CSG 3 satellite for the Italian space
00:03:52 --> 00:03:55 Agency, which officially mark company's
00:03:55 --> 00:03:56 final mission for 2025.
00:03:57 --> 00:03:59 Avery: Right, and they're not wasting any time in
00:03:59 --> 00:04:01 the new year. The very first launch scheduled
00:04:01 --> 00:04:04 for 2026 is another Falcon 9,
00:04:04 --> 00:04:06 this time carrying a fresh batch of Starlink
00:04:06 --> 00:04:09 satellites into orbit. The pace just never
00:04:09 --> 00:04:10 seems to slow down.
00:04:11 --> 00:04:12 Anna: It certainly doesn't.
00:04:12 --> 00:04:15 Sticking with our solar system, we have some
00:04:15 --> 00:04:17 incredible news from Mars that I'm very
00:04:17 --> 00:04:17 excited about.
00:04:18 --> 00:04:19 Avery: Oh, what's that?
00:04:19 --> 00:04:22 Anna: Chinese researchers have identified what they
00:04:22 --> 00:04:25 believe are eight potential karst caves in a
00:04:25 --> 00:04:28 region called Valis Kars
00:04:28 --> 00:04:28 Caves.
00:04:28 --> 00:04:31 Avery: Okay, so these aren't the usual volcanic
00:04:31 --> 00:04:33 lava tubes we've talked about before on the
00:04:33 --> 00:04:34 show.
00:04:34 --> 00:04:36 Anna: Exactly, and that's what makes this so
00:04:36 --> 00:04:39 significant. Karst caves are formed when
00:04:39 --> 00:04:42 water dissolves soluble rock like limestone.
00:04:42 --> 00:04:44 This is the first time this specific type of
00:04:44 --> 00:04:47 cave has been identified on Mars. And it's a
00:04:47 --> 00:04:49 huge indicator of past water activity.
00:04:49 --> 00:04:52 Avery: Water. That's the magic word. So this
00:04:52 --> 00:04:54 is a massive deal for the search for life,
00:04:54 --> 00:04:55 isn't it?
00:04:55 --> 00:04:58 Anna: It's a potential game changer. The surface of
00:04:58 --> 00:05:00 Mars is blasted with harsh radiation, which
00:05:00 --> 00:05:03 would destroy any delicate signs of life. But
00:05:03 --> 00:05:06 deep inside these caves, ancient
00:05:06 --> 00:05:08 biosignatures could have been preserved for
00:05:08 --> 00:05:10 billions of years perfectly shielded from
00:05:10 --> 00:05:11 that hostile environment.
00:05:11 --> 00:05:14 Avery: They're like natural time capsules. These
00:05:14 --> 00:05:16 caves must have just shot to the top of the
00:05:16 --> 00:05:18 list for places we need to explore on Mars.
00:05:19 --> 00:05:21 Absolutely fascinating stuff.
00:05:21 --> 00:05:24 Anna: It really is. And from searching for hidden
00:05:24 --> 00:05:26 life to just admiring the sheer beauty of the
00:05:26 --> 00:05:27 universe.
00:05:27 --> 00:05:29 Let's talk about the James Webb Space
00:05:29 --> 00:05:29 Telescope.
00:05:30 --> 00:05:32 Avery: Right? It's hard to believe, but it recently
00:05:32 --> 00:05:34 celebrated the fourth anniversary of its
00:05:34 --> 00:05:34 launch.
00:05:35 --> 00:05:38 Anna: Four years of revolutionary science. To mark
00:05:38 --> 00:05:40 the occasion, the European Space Agency
00:05:40 --> 00:05:43 released a spectacular video that they're
00:05:43 --> 00:05:45 calling a fly through of the cosmos.
00:05:45 --> 00:05:47 Avery: I saw this and it is stunning. They've taken
00:05:47 --> 00:05:50 some of Webb's most iconic high resolution
00:05:50 --> 00:05:52 images and created these incredible zoo.
00:05:53 --> 00:05:55 You feel like you're actually soaring through
00:05:55 --> 00:05:58 nebulas and past distant galaxy clusters.
00:05:58 --> 00:06:00 Anna: It gives you a real sense of depth and scale
00:06:00 --> 00:06:02 that you don't always get from a static
00:06:02 --> 00:06:05 image. They take you on this immersive
00:06:05 --> 00:06:07 journey through star forming regions and
00:06:07 --> 00:06:09 ancient galaxies. We'll be sure to put a link
00:06:09 --> 00:06:11 in the show notes because it's something you
00:06:11 --> 00:06:12 really have to see to believe.
00:06:13 --> 00:06:16 Avery: Definitely. It's a fantastic reminder of just
00:06:16 --> 00:06:18 how much this incredible observatory has
00:06:18 --> 00:06:20 shown us in only four years.
00:06:20 --> 00:06:22 For a final story today, we turn our
00:06:22 --> 00:06:24 attention back to Earth orbit.
00:06:24 --> 00:06:27 Anna: That's right. Iran has made a significant
00:06:27 --> 00:06:29 advancement in its national space program.
00:06:29 --> 00:06:31 The country successfully launched three of
00:06:31 --> 00:06:33 its domestically built earth observation
00:06:33 --> 00:06:34 satellites.
00:06:34 --> 00:06:37 Avery: Mhm. The satellites are named PIA,
00:06:37 --> 00:06:40 Zafar 2 and Casar. And what's
00:06:40 --> 00:06:42 also notable here is how they got to orbit.
00:06:42 --> 00:06:45 Anna: The launch was conducted on a Russian Soyuz
00:06:45 --> 00:06:47 rocket taking off from the Vostochny
00:06:47 --> 00:06:48 Cosmodrome in Russia.
00:06:48 --> 00:06:50 Avery: This really highlights the growing space
00:06:50 --> 00:06:53 collaboration between the two nations. It
00:06:53 --> 00:06:55 provides Iran with reliable access to orb.
00:06:56 --> 00:06:58 Russia gains a partner in various space
00:06:58 --> 00:06:59 activities.
00:06:59 --> 00:07:01 Anna: It's a major milestone for Iran's ambitions
00:07:01 --> 00:07:04 in space, allowing them to gather their own
00:07:04 --> 00:07:06 data for environmental monitoring,
00:07:06 --> 00:07:08 agriculture and other national applications.
00:07:08 --> 00:07:10 It's a very strategic development.
00:07:11 --> 00:07:12 Avery: And, um, that's all the time we have for
00:07:12 --> 00:07:15 today on Astronomy Daily. From the winds of
00:07:15 --> 00:07:18 red giants to hidden caves on Mars, the
00:07:18 --> 00:07:20 universe truly never fails to surprise us.
00:07:20 --> 00:07:22 Anna: We hope you've enjoyed the journey. You can
00:07:22 --> 00:07:24 find links to some of the things we
00:07:24 --> 00:07:26 discussed, including that incredible James
00:07:26 --> 00:07:28 Webb anniversary video on
00:07:28 --> 00:07:31 website@astronomydaily.IO we'd.
00:07:31 --> 00:07:33 Avery: Love it if you'd subscribe. Wherever you get
00:07:33 --> 00:07:35 your podcasts, thanks so much for tuning in.
00:07:35 --> 00:07:37 Anna: Until next time, keep looking up.