The End of an Era for SpaceX, China's Reusable Rockets, and Cosmic Conundrums

0:00 Avery: Welcome to Astronomy Daily, the podcast that

0:03 brings you the latest news from across the

0:05 cosmos, as we like to say. Give us 10

0:08 minutes and we'll give you the universe. I'm

0:11 Avery.

0:12 Anna: And I'm Anna. It's great to have you with us.

0:15 We've got a packed show for you again today

0:17 covering everything from historic launch pads

0:20 being retired to incredible new discoveries

0:23 by the James Webb Space Telescope.

0:26 Avery: That's right, Anna. we'll be looking at

0:27 China's progress on reusable rockets,

0:30 Australia's orbital ambitions, and we'll end

0:32 the show with a deep dive into some of the

0:35 biggest unsolved mysteries in space.

0:37 Anna: So let's get started. Avery. First

0:40 up is an end of an era for SpaceX.

0:43 Avery: It certainly is. SpaceX is

0:46 decommissioning its original Starship launch

0:48 pad, known as Pad 1, or

0:51 Suborbital Pad A, at its Starbase

0:54 facility in Texas. And this pad was the

0:56 workhorse for the early days of Starship

0:58 development, seeing a total of 11

1:01 flights.

1:02 Anna: It's amazing to think about the history made

1:04 there. This wasn't just a simple concrete

1:07 slab. It went through some massive upgrades

1:10 over the years.

1:11 Avery: Absolutely. it was eventually equipped with a

1:13 full launch tower, a water deluge system to

1:16 protect the pad from the intense heat of

1:18 liftoff, and even the arms designed to catch

1:21 and support the massive super heavy boosters

1:24 for reuse.

1:25 Anna: A true testament to their iterative design

1:27 process. While it's sad to see it go, I

1:30 imagine they need the space for the next

1:32 phase of development.

1:33 Avery: Exactly. They're moving on to bigger and

1:36 better things with their new orbital launch

1:38 site. But Pad one will always be remembered

1:41 as where Starship learned to fly.

1:43 Anna: Speaking of reusable rockets, SpaceX

1:46 is getting some serious competition from M.

1:48 China. The Chinese company Landspace

1:51 has been making some impressive strides.

1:54 Avery: They have. They're developing the Zhuque

1:56 3 Rocket, which looks remarkably similar to

1:59 Starship. It's a stainless steel, methane

2:02 fueled, reusable launch vehicle. And they

2:05 just hit a major milestone.

2:07 Anna: The static fire test. Right. That's a

2:09 crucial step.

2:10 Avery: Right. They successfully completed a

2:13 static fire test of the first stage

2:15 prototype. This is where they fire up the

2:17 engines while the rocket is securely bolted

2:20 to the ground to testing the entire system

2:22 under flight light conditions.

2:24 Anna: So what's next for them?

2:26 Avery: Landspace is aiming for its first orbital

2:28 flight test in late 2025. This

2:31 is all part of a much larger ambition for

2:33 China, which is heavily investing in building

2:36 its own space infrastructure, including a

2:38 satellite constellation similar to Starlink.

2:41 The pace of their development is really

2:43 Something to watch.

2:44 Anna: From engineering marvels on Earth to

2:47 incredible discoveries far from home, the

2:50 James Webb Space Telescope has deep done it

2:52 again. This time giving us a peek into how

2:55 moons might be born.

2:56 Avery: This story is fascinating. Webb has

2:59 observed a disk of material swirling around

3:01 an exoplanet about 600 light years away.

3:05 Anna: And this isn't just any disk. It's

3:08 what's known as a circumplanetary disk.

3:10 And it's the first time we've seen one that

3:13 is rich in carbon. Scientists believe

3:16 these disks are the birthplaces of moons,

3:18 or exomoons in this case.

3:21 Avery: So we're essentially watching a, moon system

3:23 in the process of forming. Much like how the

3:26 moons of Jupiter or Saturn might have formed

3:28 in our own solar system billions of years

3:30 ago.

3:30 Anna: Precisely. The finding provides a, ah, rare

3:34 real time look at the building blocks of

3:36 moons and helps us understand the conditions

3:39 under which they form. The power of the Webb

3:41 telescope continues to unlock secrets of

3:44 planetary formation that were completely out

3:47 of reach just a few years ago.

3:49 Avery: Lets bring our focus back to Earth now,

3:51 specifically to Australia. The Australian

3:54 rocket company Gilmour Space is gearing up

3:57 for another shot at reaching orbit.

3:59 Anna: Their first attempt didn't quite make it, did

4:01 it?

4:02 Avery: Unfortunately not. The flight was terminated

4:05 shortly after liftoff due to an anomaly.

4:08 But in the world of spaceflight, failure

4:11 is often part of the process. The company

4:13 has analyzed the data and is now targeting

4:16 2026 for its second orbital

4:19 attempt.

4:20 Anna: It's a resilient industry. What does

4:23 this mean for Australia's space program?

4:26 Avery: It's a huge deal. A successful launch

4:28 would make Australia the 12th country to

4:31 reach orbit from its own soil. Gilmour

4:34 Space remains optimistic and their

4:36 determination is really fueling the growth of

4:39 the nation's sovereign space industry. We'll

4:41 be watching closely in 2026.

4:44 Anna: All right, for our final segment, let's,

4:47 let's venture into the unknown. Despite

4:50 all our incredible technology and

4:53 discoveries, space is still filled with

4:56 profound mysteries that continue to puzzle

4:59 scientists.

5:00 Avery: My favorite kind of topic, where do we start?

5:03 Anna: Let's start with the big one, the Hubble

5:06 Tension. For years there's been a major

5:09 disagreement on just how fast the universe

5:11 is expanding. Measurements from the early

5:14 universe, like the cosmic microwave

5:17 background, give us one number. But

5:20 measurements from the local modern universe

5:23 using things like supernovae give us

5:26 a different number faster.

5:28 Avery: And the fact that they don't match suggests

5:31 we might be missing something fundamental

5:33 about the physics of the cosmos.

5:35 Anna: Exactly. Next up,

5:38 fast radio bursts or FRBs.

5:41 These are incredibly powerful

5:44 millisecond long bursts of radio Waves from

5:46 deep space. We know they come from

5:49 distant galaxies, but we have no idea

5:52 what causes them. Theories range from

5:54 magnetars to alien signals,

5:57 but nothing fits all the data.

6:00 Avery: A, true cosmic whodunnit.

6:02 Anna: Then there's the giant elephant in the room.

6:05 Dark matter. We see its gravitational

6:08 effects everywhere. In the rotation of

6:11 galaxies, in the bending of starlight.

6:14 But we can't see the stuff itself.

6:17 It makes up about 85% of the

6:19 matter in the universe and we have no

6:22 idea what it is.

6:24 Avery: It's humbling to think that we've only ever

6:26 observed a tiny fraction of what's actually

6:29 out there.

6:30 Anna: It really is. Lets touch on

6:33 a few more strange ones. We recently

6:35 detected the second longest gamma ray burst

6:38 ever seen. It lasted for over a thousand

6:42 seconds. We think these bursts come

6:44 from collapsing massive stars. But

6:47 one lasting that long challenges our

6:50 models. Wow. Then there's

6:52 Hoag's object. A bizarre galaxy that looks

6:55 like a perfect ring of young blue stars

6:58 surrounding an older yellow nucleus

7:01 with almost nothing in between. We

7:04 don't know how it formed.

7:06 Avery: That sounds like something out of science

7:08 fiction.

7:09 Anna: And another great mystery closer to home.

7:12 The hunt for Planet nine. The strange

7:15 clustered orbits of several objects in the

7:18 outer solar system suggest there might be

7:20 a massive undiscovered planet lurking

7:23 out there, 10 times the mass of Earth.

7:26 But despite years of searching, we haven't

7:29 found it.

7:30 Avery: These mysteries are what make astronomy so

7:32 exciting. For every answer we find, we

7:35 uncover 10 new questions. The list of

7:38 cosmic conundrums is seemingly endless.

7:41 Take the Great Attractor for instance. It's a

7:44 massive gravitational anomaly located in the

7:47 direction of the Hydra Centaurus

7:49 supercluster, pulling our Milky Way and

7:51 countless other galaxies towards it at

7:53 incredible speeds. The the problem is we

7:56 can't observe it directly because it's hidden

7:59 behind the zone of avoidance, the dusty

8:02 star filled plane of our own galaxy.

8:04 Anna: It's a mind boggling concept, like a

8:07 hidden cosmic behemoth shaping the

8:10 structure of our local universe. And

8:12 speaking of strange observations, we have to

8:15 talk about Tabby's star. Also known as

8:18 KIC

8:19 846-2852.

8:22 This star exhibits bizarre and

8:24 extreme dips in its brightness. We're not

8:27 talking about the tiny regular dimming of a

8:30 transiting exoplanet. These are

8:33 massive irregular drops at one

8:36 point blocking over 20% of the

8:39 starlight.

8:40 Avery: That's the star that famously led to

8:42 speculation about alien megastructures

8:45 like a Dyson swarm. While that's an exciting

8:47 thought, the more plausible, though still

8:50 unconfirmed explanation is is a vast

8:52 uneven ring of cosmic dust orbiting the

8:55 star. But the irregular nature of the dimming

8:58 events makes it a persistent m and unique

9:00 puzzle that defies easy explanation.

9:04 Anna: It's a perfect example of how one

9:07 strange object can challenge our assumptions.

9:10 Then there's the other side of the dark coin.

9:13 Dark energy. We discussed dark matter,

9:16 the invisible glue holding galaxies together.

9:20 Dark energy is its antithesis,

9:23 a mysterious, repulsive force

9:25 causing the expansion of the universe to

9:28 accelerate. It's believed to account for

9:30 nearly 70% of the universe's total

9:33 energy density. And we have almost no

9:36 idea what it is.

9:38 Avery: So, to recap, about 25%

9:41 of the universe is dark matter, which we

9:43 can't see, and about 70 70% is

9:46 dark energy, which we can't explain.

9:50 That means all the stars, planets, and

9:52 galaxies, everything we've ever observed,

9:55 make up less than 5% of the cosmos.

9:58 It's an incredibly humbling realization and

10:01 drives home how much is left to discover.

10:04 Anna: Absolutely. And perhaps the most profound

10:07 mystery is one that strikes at the heart

10:09 of physics itself. The black hole

10:12 information paradox. General

10:15 relativity suggests that information that

10:18 falls into a black hole is gone forever,

10:21 completely erased from the universe. However,

10:24 a fundamental law of quantum mechanics

10:27 states that information can never truly be

10:30 destroyed.

10:31 Avery: This creates a fundamental conflict between

10:34 our two best theories describing the

10:36 universe. To solve it, physicists may need a

10:39 unified theory of quantum gravity, one that

10:42 can explain both the macroscopic world of

10:44 gravity and the microscopic world of

10:47 quantum particles. Finding that solution

10:50 could represent the single greatest leap in

10:52 our understanding of reality.

10:54 Anna: It's incredible. These puzzles,

10:57 from cosmic structures to fundamental

11:00 paradoxes, are, the driving force behind

11:02 modern astronomy. They ensure that for

11:05 every discovery we make, an even more

11:08 fascinating question is waiting just beyond

11:11 the horizon. And that's a perfect note

11:14 to end on. It's a reminder of just how

11:17 much there is still to explore.

11:19 Avery: That's all the time we have for today's

11:21 Astronomy Daily. We hope you enjoyed our

11:23 journey through the latest in space news and

11:26 cosmic mysteries. Join us next time as we

11:28 continue to explore the universe. I'm Avery.

11:31 Anna: And I'm Anna. Until then, keep looking

11:34 up.