- New Method for Detecting Gravitational Waves: Physicists are proposing a groundbreaking approach to detect mid-band gravitational waves, a frequency range currently unreachable by existing instruments. Utilizing optical resonator technology, this novel method could expand our understanding of systems like binary white dwarfs and massive black hole mergers, paving the way for a potential global network of detectors.
- Reevaluating Exoplanet Water Content: Recent research challenges the assumption that sub-Neptunes, like K2 18B, are covered by vast oceans. A study from ETH Zurich suggests that water on these planets may be limited due to chemical processes that destroy H2O molecules during their formation, significantly altering our perspective on habitability in the universe.
- Close Encounter with Asteroid 2025 TF: A small asteroid, designated 2025 TF, made a remarkably close approach to Earth on September 30th, flying within 250 miles of our planet. Although detected only hours after its closest pass, this event underscores the challenges of tracking smaller objects in our solar neighborhood.
- Australia's Growing Space Industry: Gilmour Space Technologies recently attempted its first orbital launch with the Ares small launch vehicle. Despite a short flight of just 14 seconds, the company is optimistic about future launches as they navigate regulatory hurdles, aiming to establish a reliable domestic launch capability for Australia.
- 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 Anna and Avery signing off. Until next time, keep looking up and exploring the wonders of our universe.
Gravitational Wave Detection Proposal
[University of Birmingham](https://www.birmingham.ac.uk)
Exoplanet Water Research
[ETH Zurich](https://ethz.ch/en.html)
Asteroid 2025 TF Details
[NASA](https://www.nasa.gov)
Gilmour Space Technologies Update
[Gilmour Space](https://www.gilmourspace.com)
Astronomy Daily
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00:00:00 --> 00:00:02 Anna: Welcome to Astronomy Daily, your essential
00:00:02 --> 00:00:05 guide to the cosmos. I'm Anna, ready to
00:00:05 --> 00:00:06 explore the latest celestial happenings.
00:00:07 --> 00:00:09 Avery: And I'm Avery joining you with today's
00:00:09 --> 00:00:12 headlines. We have some truly fascinating
00:00:12 --> 00:00:15 stories lined up, from groundbreaking new
00:00:15 --> 00:00:18 methods for detecting gravitational waves to
00:00:18 --> 00:00:20 surprising discoveries about the water
00:00:20 --> 00:00:22 content of distant exoplanets.
00:00:22 --> 00:00:25 Anna: Indeed, we'll also cover a recent very close
00:00:25 --> 00:00:27 asteroid flyby that you might have missed.
00:00:27 --> 00:00:29 And get an update on Australia's growing
00:00:29 --> 00:00:30 space industry with Gilmour Space
00:00:30 --> 00:00:33 Technologies. It's a packed show, so let's
00:00:33 --> 00:00:33 get started.
00:00:34 --> 00:00:36 Our first stop takes us to the cutting edge
00:00:36 --> 00:00:39 of physics with an exciting new proposal for
00:00:39 --> 00:00:42 detecting gravitational waves. These ripples
00:00:42 --> 00:00:44 in space time predicted by Einstein are
00:00:44 --> 00:00:45 notoriously elusive.
00:00:46 --> 00:00:48 Avery: That's right, Anna. Physicists, uh, have put
00:00:48 --> 00:00:51 forward a novel approach to detect what they
00:00:51 --> 00:00:54 call mid band gravitational waves.
00:00:54 --> 00:00:55 Operating between
00:00:56 --> 00:00:59 0 and 1 Hz.
00:00:59 --> 00:01:01 This is a frequency range that existing
00:01:01 --> 00:01:04 instruments just can't reach effectively.
00:01:04 --> 00:01:06 Anna: And these mid band waves are crucial because
00:01:06 --> 00:01:09 they're generated by fascinating systems like
00:01:09 --> 00:01:12 binary white dwarfs and neutron stars within
00:01:12 --> 00:01:14 our own Milky Way, as well as the mergers of
00:01:14 --> 00:01:16 massive black holes.
00:01:17 --> 00:01:19 What's the secret to this new detection
00:01:19 --> 00:01:19 method?
00:01:20 --> 00:01:22 Avery: It relies on optical resonator technology
00:01:22 --> 00:01:24 originally designed for highly precise
00:01:24 --> 00:01:27 optical atomic clocks. Dr. Vera
00:01:27 --> 00:01:30 Guerrera from the University of Birmingham
00:01:30 --> 00:01:32 highlights that this extends our detection
00:01:32 --> 00:01:34 capabilities into a new frequency range using
00:01:34 --> 00:01:36 instruments that are laboratory sized.
00:01:37 --> 00:01:40 Anna: Laboratory sized? That's quite a departure
00:01:40 --> 00:01:42 from the massive LIGO and Virgo
00:01:42 --> 00:01:44 interferometers we're familiar with. This
00:01:44 --> 00:01:45 could open up a whole new realm of
00:01:45 --> 00:01:47 possibilities, perhaps even a, uh, global
00:01:47 --> 00:01:49 network of detectors sooner than anticipated.
00:01:50 --> 00:01:53 Avery: Precisely. The proposed system uses
00:01:53 --> 00:01:55 two optical cavities. Essentially mirrors
00:01:55 --> 00:01:57 bouncing laser light back and forth
00:01:58 --> 00:02:01 at right angles. While mid band gravitational
00:02:01 --> 00:02:04 waves don't deform the rigid cavity
00:02:04 --> 00:02:07 spacer, they subtly alter the phase of the
00:02:07 --> 00:02:09 light itself. And here's the genius.
00:02:10 --> 00:02:12 State of the art optical cavities are already
00:02:12 --> 00:02:15 sensitive enough to pick up these minute
00:02:15 --> 00:02:15 changes.
00:02:16 --> 00:02:18 Anna: So it's about exploiting existing super
00:02:18 --> 00:02:21 sensitive tech for a new purpose. Professor
00:02:21 --> 00:02:24 Xavier Calmette from the University of Sussex
00:02:24 --> 00:02:26 added that this detector will allow us to
00:02:26 --> 00:02:29 test astrophysical models of binary systems,
00:02:29 --> 00:02:32 explore massive black hole mergers, and even
00:02:32 --> 00:02:33 search for stochastic backgrounds from the
00:02:33 --> 00:02:35 early universe. Truly phenomenal
00:02:36 --> 00:02:37 indeed.
00:02:37 --> 00:02:40 Avery: While large space based laser interferometers
00:02:40 --> 00:02:43 like LISA are still about a decade away,
00:02:43 --> 00:02:46 this optical cavity detector offers an
00:02:46 --> 00:02:48 immediate and cost effective ground based
00:02:48 --> 00:02:51 solution for mid band exploration. It
00:02:51 --> 00:02:54 may be less sensitive, but its immediacy
00:02:54 --> 00:02:55 makes it a game changer.
00:02:56 --> 00:02:59 Okay, moving from the ripples of space time
00:02:59 --> 00:03:02 to the surfaces of distant worlds. We have
00:03:02 --> 00:03:04 new research challenging our understanding of
00:03:04 --> 00:03:07 exoplanets, Specifically their water content.
00:03:08 --> 00:03:10 It seems the universe might be a bit drier
00:03:10 --> 00:03:11 than we once thought.
00:03:12 --> 00:03:14 Anna: This is a big one, Avery. For years,
00:03:14 --> 00:03:17 theories have suggested that many exoplanets,
00:03:17 --> 00:03:20 particularly sub Neptunes like K2 18B,
00:03:20 --> 00:03:22 could be entirely covered by deep global
00:03:22 --> 00:03:25 oceans, Making them potentially habitable.
00:03:25 --> 00:03:28 These were often dubbed hycean planets, A
00:03:28 --> 00:03:30 portmanteau of hydrogen and ocean Assuming
00:03:30 --> 00:03:31 vast amounts of water.
00:03:32 --> 00:03:35 Avery: Exactly. Sub neptunes are
00:03:35 --> 00:03:37 larger than Earth, but smaller than Neptune.
00:03:37 --> 00:03:40 Very common in our galaxy, but absent
00:03:40 --> 00:03:43 from our own solar system. Many are thought
00:03:43 --> 00:03:45 to have formed far from their stars beyond
00:03:45 --> 00:03:48 the snow line, Accumulating ice before
00:03:48 --> 00:03:51 migrating closer. The prevailing
00:03:51 --> 00:03:54 idea was that they'd retain a massive water
00:03:54 --> 00:03:54 envelope.
00:03:55 --> 00:03:57 Anna: However, this new study, led by Eth Zurich
00:03:57 --> 00:03:59 and published in the Astrophysical Journal
00:03:59 --> 00:04:02 Letters, introduces a crucial
00:04:02 --> 00:04:04 chemical coupling between the planet's
00:04:04 --> 00:04:07 atmosphere and its interior. Caroline
00:04:07 --> 00:04:10 Dorn, professor of exoplanets at Eth Zurich,
00:04:10 --> 00:04:13 put it quite Water on planets is
00:04:13 --> 00:04:15 much more limited than previously believed.
00:04:15 --> 00:04:18 Avery: The researcher simulated sub neptunes going
00:04:18 --> 00:04:20 through a deep hot magma ocean phase with the
00:04:20 --> 00:04:23 hydrogen gas Shel. Their computer models
00:04:23 --> 00:04:25 show that during this phase, Chemical
00:04:25 --> 00:04:28 processes actually destroy most
00:04:28 --> 00:04:30 H2O water molecules. The
00:04:30 --> 00:04:33 hydrogen and oxygen atoms attach to metallic
00:04:33 --> 00:04:35 compounds and disappear into the planet's
00:04:35 --> 00:04:38 core. The conclusion is any water
00:04:38 --> 00:04:41 remaining on the surface is likely limited to
00:04:41 --> 00:04:43 just a few percent at most.
00:04:43 --> 00:04:45 Anna: That dramatically changes our perspective on
00:04:45 --> 00:04:47 habitability. If these larger exoplanets are
00:04:47 --> 00:04:49 far drier than we imagined, it makes the
00:04:49 --> 00:04:52 search for extraterrestrial life even more
00:04:52 --> 00:04:54 challenging. Conditions suitable for liquid
00:04:54 --> 00:04:56 water would likely only exist on smaller
00:04:56 --> 00:04:59 planets. And even those would require better
00:04:59 --> 00:05:01 telescopes than James Webb to observe
00:05:01 --> 00:05:01 clearly.
00:05:01 --> 00:05:04 Avery: Indeed, and here's a paradox. The
00:05:04 --> 00:05:07 study suggests that the most water rich
00:05:07 --> 00:05:09 atmospheres Might actually be found on
00:05:09 --> 00:05:11 planets formed within the snow line, where
00:05:11 --> 00:05:14 water wasn't initially accumulated ice,
00:05:14 --> 00:05:17 but rather produced chemically from hydrogen
00:05:17 --> 00:05:20 reacting with oxygen from from silicates in
00:05:20 --> 00:05:23 the magma ocean. It challenges the classic
00:05:23 --> 00:05:26 link between ice rich formation and water
00:05:26 --> 00:05:28 rich atmospheres, Emphasizing the role of
00:05:28 --> 00:05:31 magma ocean atmosphere equilibrium.
00:05:31 --> 00:05:34 Anna: A truly fascinating insight. So
00:05:34 --> 00:05:36 rather than being extraordinary, Earth might
00:05:36 --> 00:05:38 just appear as a typical planet in this new
00:05:38 --> 00:05:41 model. That in reality, we may not be as
00:05:41 --> 00:05:44 unique as we previously thought we were. This
00:05:44 --> 00:05:46 kind of research is critical for refining our
00:05:46 --> 00:05:48 understanding of planetary formation and the
00:05:48 --> 00:05:50 conditions for life in the vastness of space
00:05:50 --> 00:05:50 Space.
00:05:51 --> 00:05:53 Now let's turn our attention closer to home.
00:05:53 --> 00:05:56 Though still in space, there was a recent
00:05:56 --> 00:05:58 celestial visitor that made Quite a close
00:05:58 --> 00:06:00 approach to Earth, largely unnoticed by the
00:06:00 --> 00:06:01 general public.
00:06:02 --> 00:06:04 Avery: That's right, Anna, uh, a small asteroid
00:06:04 --> 00:06:06 designated 2025 TF
00:06:07 --> 00:06:09 safely zipped past Earth on Tuesday,
00:06:09 --> 00:06:11 September 30th at approximately
00:06:11 --> 00:06:14 8:49pm EDT. Its
00:06:14 --> 00:06:17 closest approach was roughly 250
00:06:17 --> 00:06:20 miles, or 400 kilometers above our
00:06:20 --> 00:06:20 planet's surface.
00:06:21 --> 00:06:23 Anna: For context, that's about the same altitude
00:06:23 --> 00:06:25 as the International Space Station. It wasn't
00:06:25 --> 00:06:28 a record, as asteroid 2020 VT4 flew by
00:06:28 --> 00:06:31 even closer at 230 miles five years ago.
00:06:32 --> 00:06:34 But still an incredibly close shave.
00:06:34 --> 00:06:37 Avery: Indeed. And how big was this particular
00:06:38 --> 00:06:39 cosmic pebble?
00:06:40 --> 00:06:42 2025 TF is
00:06:42 --> 00:06:45 estimated to be about the size of a
00:06:45 --> 00:06:47 couch, roughly 1.2
00:06:47 --> 00:06:50 to 2.7 meters in diameter.
00:06:51 --> 00:06:54 Interestingly, astronomers only spotted
00:06:54 --> 00:06:57 it a few hours after its closest approach,
00:06:57 --> 00:07:00 with the Catalina Sky Survey being the
00:07:00 --> 00:07:01 first to detect it.
00:07:02 --> 00:07:03 Anna: That's a testament to how challenging these
00:07:03 --> 00:07:06 smaller objects are to track, especially when
00:07:06 --> 00:07:09 they come from the sunward direction. Due to
00:07:09 --> 00:07:11 a government shutdown, NASA hasn't issued a
00:07:11 --> 00:07:14 formal statement. But data from JPL's
00:07:14 --> 00:07:16 CNEOS confirmed a uh, nominal distance of
00:07:16 --> 00:07:19 4 miles from Earth's
00:07:19 --> 00:07:21 center, which corresponds to that
00:07:21 --> 00:07:24 262 mile altitude over
00:07:24 --> 00:07:25 Antarctica.
00:07:25 --> 00:07:28 Avery: While NASA, uh, meticulously monitors larger
00:07:28 --> 00:07:31 asteroids that could pose a threat, smaller
00:07:31 --> 00:07:34 rocks like 2025 TF are much harder to
00:07:34 --> 00:07:36 spot. However, our technology is
00:07:36 --> 00:07:39 constantly improving and such close safe
00:07:39 --> 00:07:41 passes are now being detected several times a
00:07:41 --> 00:07:44 week. It's a reminder of the dynamic nature
00:07:44 --> 00:07:45 of our solar neighborhood.
00:07:46 --> 00:07:48 Finally today, let's head down under for an
00:07:48 --> 00:07:50 update on Australia's burgeoning space
00:07:50 --> 00:07:53 industry. Gilmour Space Technologies recently
00:07:53 --> 00:07:56 made its first orbital launch attempt for its
00:07:56 --> 00:07:57 Ares small launch vehicle.
00:07:57 --> 00:07:59 Anna: And while that launch attempt on July 30
00:07:59 --> 00:08:02 lasted only a few seconds, 14 to be precise,
00:08:02 --> 00:08:04 the company is surprisingly satisfied with
00:08:04 --> 00:08:07 the outcome and is already planning a return
00:08:07 --> 00:08:10 to flight next year. CEO Adam
00:08:10 --> 00:08:12 Gilmour stated that while the rocket was in
00:08:12 --> 00:08:15 flight for only 14 seconds and its engines
00:08:15 --> 00:08:18 fired for 23 seconds, it still provided
00:08:18 --> 00:08:20 invaluable data for their next generation
00:08:20 --> 00:08:20 rockets.
00:08:21 --> 00:08:24 Avery: That's certainly a pragmatic outlook after
00:08:24 --> 00:08:26 what sounds like a less than ideal initial
00:08:26 --> 00:08:29 launch. Gilmour Space is
00:08:29 --> 00:08:31 investigating the root cause, suspecting an
00:08:31 --> 00:08:34 issue that wasn't sufficiently tested under
00:08:34 --> 00:08:36 conditions closer to actual launch.
00:08:37 --> 00:08:40 But a significant factor in this first Launch
00:08:40 --> 00:08:43 was an 18 month delay between shipping the
00:08:43 --> 00:08:44 rocket and the actual launch.
00:08:45 --> 00:08:47 Anna: 18 months is an enormous delay for any space
00:08:47 --> 00:08:50 company. This was largely due to regulatory
00:08:50 --> 00:08:52 approvals. An astounding 24 permits from the
00:08:52 --> 00:08:55 Queensland government alone, plus approvals
00:08:55 --> 00:08:57 from the Australian Space Agency airspace,
00:08:57 --> 00:09:00 maritime and environmental permits. Adam
00:09:00 --> 00:09:02 Gilmour openly admitted they hadn't
00:09:02 --> 00:09:04 adequately resourced those complex regulatory
00:09:04 --> 00:09:06 processes and regretted not doing more
00:09:06 --> 00:09:08 testing during those prolonged delays.
00:09:08 --> 00:09:11 Avery: An incredible bureaucratic hurdle. Despite
00:09:11 --> 00:09:13 the very short flight, he was quite pleased
00:09:13 --> 00:09:16 it even managed to get off the pad, Candidly
00:09:16 --> 00:09:19 referring to it as an old, clunky rocket by
00:09:19 --> 00:09:22 the time it finally flew. It speaks volumes
00:09:22 --> 00:09:24 about the challenges of pioneering a new
00:09:24 --> 00:09:25 space launch capability.
00:09:26 --> 00:09:29 Anna: Absolutely. However, Gilmour Space
00:09:29 --> 00:09:31 anticipates a much smoother regulatory
00:09:31 --> 00:09:33 process for future launches after productive
00:09:33 --> 00:09:36 meetings with the Australian Space Agency now
00:09:36 --> 00:09:37 that they've navigated the initial
00:09:37 --> 00:09:40 complexities, he remains confident in future
00:09:40 --> 00:09:42 launches, aiming to provide a reliable
00:09:42 --> 00:09:43 domestic launch capability.
00:09:44 --> 00:09:46 Avery: And importantly, the company is well
00:09:46 --> 00:09:49 capitalized, planning to launch again next
00:09:49 --> 00:09:51 year. This is a crucial step for Australia,
00:09:51 --> 00:09:54 as Gilmour Space Technologies is a key
00:09:54 --> 00:09:56 player in fostering a, uh, growing and
00:09:56 --> 00:09:59 competitive Australian space industry on the
00:09:59 --> 00:10:00 global stage.
00:10:01 --> 00:10:03 Anna: What a journey through the cosmos today,
00:10:03 --> 00:10:06 Avery. From the subtle dance of
00:10:06 --> 00:10:09 gravitational waves to the surprisingly dry
00:10:09 --> 00:10:11 interiors of exoplanets, and from a close
00:10:11 --> 00:10:13 call with an asteroid to the determined
00:10:13 --> 00:10:15 efforts of Gilmore Space, it's been an
00:10:15 --> 00:10:17 episode packed with discoveries.
00:10:18 --> 00:10:21 Avery: Indeed, Anna. It's a vivid reminder of how
00:10:21 --> 00:10:23 quickly our understanding of the universe is
00:10:23 --> 00:10:26 evolving. Each new piece of research, whether
00:10:26 --> 00:10:29 it's about detecting unseen forces or
00:10:29 --> 00:10:32 rethinking planetary formation, pushes the
00:10:32 --> 00:10:34 boundaries of human human knowledge a little
00:10:34 --> 00:10:34 further.
00:10:34 --> 00:10:36 Anna: And it's not just the scientific discoveries,
00:10:36 --> 00:10:39 Avery. It's also about the incredible
00:10:39 --> 00:10:41 ingenuity in how we pursue these discoveries.
00:10:41 --> 00:10:44 From laboratory sized gravitational wave
00:10:44 --> 00:10:47 detectors to navigating complex regulatory
00:10:47 --> 00:10:50 landscapes for space launches, the
00:10:50 --> 00:10:52 human spirit of exploration is as vast as the
00:10:52 --> 00:10:53 cosmos itself.
00:10:54 --> 00:10:56 Avery: That's beautifully put, Anna. Ah, this
00:10:56 --> 00:10:59 continuous push for knowledge, coupled with
00:10:59 --> 00:11:01 innovation in technology and even policy,
00:11:02 --> 00:11:05 truly underscores our inherent drive to
00:11:05 --> 00:11:08 understand our place in the universe. It's a
00:11:08 --> 00:11:10 journey that constantly redefines what's
00:11:10 --> 00:11:10 possible.
00:11:11 --> 00:11:12 Anna: And that wraps up another episode of
00:11:12 --> 00:11:15 Astronomy Daily. Thank you for joining us on
00:11:15 --> 00:11:16 this exploration of the universe.
00:11:17 --> 00:11:18 Avery: We hope you enjoyed delving into these
00:11:18 --> 00:11:20 stories with us. Don't forget to subscribe
00:11:20 --> 00:11:22 wherever you get your podcasts to stay
00:11:22 --> 00:11:24 updated with all the latest from beyond our
00:11:24 --> 00:11:27 blue planet. Until next time, keep looking up