- SpaceX's Pivotal Ninth Starship Test Flight: Join us as we delve into the significance of SpaceX's upcoming ninth Starship test flight, marking the first reuse of a Super Heavy booster. With the mission set for May 27, we explore the advancements made since previous flights and the ambitious objectives that lie ahead.
- A Surprising Discovery in Galaxy Evolution: Astronomers have identified a massive galaxy, Ruby's UDS QGZ7, that halted star formation merely 700 million years after the Big Bang. This revelation challenges existing theories about galaxy development and suggests a need to rethink our understanding of cosmic evolution.
- Potential Threats from Venus Co-Orbital Asteroids: Uncover a new category of asteroids co-orbiting with Venus that may pose a significant threat to Earth. With their elusive nature and chaotic orbits, these objects could challenge our current planetary defence strategies.
- Scientific Treasures from SpaceX's Dragon Capsule: Celebrate the successful return of SpaceX's Dragon capsule, which brought back 6,700 pounds of scientific equipment from the International Space Station. Discover the groundbreaking experiments and materials that could revolutionise spacecraft design and satellite maintenance.
- The Cosmic Powerhouses of the Early Universe: Explore how tiny dwarf galaxies played a crucial role in reionising the universe after the Big Bang, clearing the primordial fog and transitioning our cosmos from darkness to light. This discovery highlights the importance of small entities in driving significant cosmic transformations.
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 signing off. Until next time, keep looking up and stay curious about the wonders of our universe.
Chapters:
00:00 - Welcome to Astronomy Daily
01:10 - SpaceX's pivotal ninth Starship test flight
10:00 - A surprising discovery in galaxy evolution
15:30 - Potential threats from Venus co-orbital asteroids
20:00 - Scientific treasures from SpaceX's Dragon capsule
25:00 - The cosmic powerhouses of the early universe
✍️ Episode References
SpaceX Updates
[SpaceX](https://www.spacex.com/)
Galaxy Evolution Research
[Max Planck Institute for Astronomy](https://www.mpia.de/)
Planetary Defence Strategies
[NASA](https://www.nasa.gov/)
International Space Station Research
[NASA ISS](https://www.nasa.gov/mission_pages/station/main/index.html)
Dwarf Galaxies Study
[Hubble Space Telescope](https://hubblesite.org/)
Astronomy Daily
[Astronomy Daily](http://www.astronomydaily.io/)
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00:00:00 --> 00:00:02 Anna: Welcome to Astronomy Daily, your source for
00:00:02 --> 00:00:04 the latest developments in space exploration
00:00:04 --> 00:00:07 and astronomical discoveries. I'm, your host,
00:00:07 --> 00:00:09 Anna, and we have a packed show for you today
00:00:09 --> 00:00:11 with some truly fascinating stories from
00:00:11 --> 00:00:14 across the cosmos. We'll be diving into
00:00:14 --> 00:00:17 SpaceX's upcoming ninth Starship test flight,
00:00:17 --> 00:00:19 which represents a major milestone for the
00:00:19 --> 00:00:22 programme as they attempt the first reuse of
00:00:22 --> 00:00:24 a super heavy booster. Then we'll
00:00:24 --> 00:00:27 explore a surprising discovery about galaxy
00:00:27 --> 00:00:30 evolution. Astronomers have found a
00:00:30 --> 00:00:32 massive galaxy that mysteriously stopped
00:00:32 --> 00:00:35 forming stars when the universe was just a
00:00:35 --> 00:00:37 cosmic toddler, challenging everything we
00:00:37 --> 00:00:39 thought we knew about how galaxies develop.
00:00:40 --> 00:00:42 We'll also examine a potential threat that
00:00:42 --> 00:00:45 may be hiding in plain sight. Then,
00:00:45 --> 00:00:48 from the International Space Station, we'll
00:00:48 --> 00:00:50 look at the scientific treasures that just
00:00:50 --> 00:00:53 returned aboard SpaceX's Dragon capsule.
00:00:53 --> 00:00:55 And finally, we'll shed light on what
00:00:55 --> 00:00:57 literally turned on the lights in our early
00:00:57 --> 00:01:00 universe. And ah, as new data reveals, the
00:01:00 --> 00:01:03 surprising cosmic powerhouses responsible
00:01:03 --> 00:01:05 for illuminating the darkness after the Big
00:01:05 --> 00:01:05 Bang.
00:01:06 --> 00:01:08 So let's get started with today's news.
00:01:09 --> 00:01:11 SpaceX is gearing up for what could be a
00:01:11 --> 00:01:13 pivotal moment in the Starship development
00:01:13 --> 00:01:16 programme with its ninth test flight
00:01:16 --> 00:01:18 scheduled for Tuesday, May 27.
00:01:18 --> 00:01:21 Liftoff is targeted for 6:30pm Central
00:01:21 --> 00:01:24 Time from SpaceX's Starbase facility in
00:01:24 --> 00:01:26 Texas, with the launch window extending to
00:01:26 --> 00:01:28 8pm this mission carries extra
00:01:28 --> 00:01:30 significance as it marks the first time
00:01:30 --> 00:01:33 SpaceX will reuse a Super Heavy booster.
00:01:33 --> 00:01:35 Booster 14, which previously flew during
00:01:35 --> 00:01:37 Flight 7 and was successfully caught by the
00:01:37 --> 00:01:40 launch tower, will make its second journey to
00:01:40 --> 00:01:43 space a crucial step toward SpaceX's
00:01:43 --> 00:01:45 ultimate goal of full reusability.
00:01:45 --> 00:01:47 The previous two Starship test flights ended
00:01:47 --> 00:01:49 in disappointment, with both ships failing
00:01:49 --> 00:01:51 just before reaching second stage engine
00:01:51 --> 00:01:54 cutoff. Flight 7's ship 33
00:01:54 --> 00:01:56 experienced fires in the attic above the
00:01:56 --> 00:01:58 engine bay due to a harmonic response issue
00:01:58 --> 00:02:01 during ascent, while Flight 8's Ship 34
00:02:01 --> 00:02:03 suffered a hardware failure in one of its sea
00:02:03 --> 00:02:05 level Raptor engines, leading to a fire in
00:02:05 --> 00:02:08 the engine bay M. Despite these setbacks,
00:02:08 --> 00:02:10 both missions saw successful booster
00:02:10 --> 00:02:13 recoveries, providing valuable data and
00:02:13 --> 00:02:15 hardware experience for the programme.
00:02:16 --> 00:02:18 SpaceX has confirmed that the harmonic
00:02:18 --> 00:02:20 resonance problem from Flight 7 has been
00:02:20 --> 00:02:23 fixed and they've implemented additional
00:02:23 --> 00:02:26 improvements for Flight 9. Ship 35
00:02:26 --> 00:02:28 will be attempting to fly past the point
00:02:28 --> 00:02:30 where its predecessors failed, aiming to
00:02:30 --> 00:02:33 complete its full mission profile. If
00:02:33 --> 00:02:35 successful, it would represent a major
00:02:35 --> 00:02:37 breakthrough for the Starship programme. The
00:02:37 --> 00:02:39 mission objectives remain similar to previous
00:02:39 --> 00:02:42 flights, with the ship expected to perform a
00:02:42 --> 00:02:44 splashdown in the Indian Ocean after
00:02:44 --> 00:02:47 completing several experiments. These
00:02:47 --> 00:02:49 experiments include deploying eight Starlink
00:02:49 --> 00:02:52 satellite simulators, relighting a Raptor
00:02:52 --> 00:02:54 engine in flight and testing various areas of
00:02:54 --> 00:02:57 the heat shield. The heat shield will feature
00:02:57 --> 00:03:00 metallic tiles, an actively cooled tile,
00:03:00 --> 00:03:02 missing tiles to test durability during
00:03:02 --> 00:03:05 reentry, and tapered edge tiles between the
00:03:05 --> 00:03:07 aft flaps and catch points. While the
00:03:07 --> 00:03:10 ship's trajectory remains largely unchanged
00:03:10 --> 00:03:13 from previous flights, Booster 14 will follow
00:03:13 --> 00:03:15 a different path this time. unlike Flight
00:03:15 --> 00:03:18 7, SpaceX will not attempt to catch
00:03:18 --> 00:03:21 the booster, instead directing it to perform
00:03:21 --> 00:03:23 an experimental RE entry before splashing
00:03:23 --> 00:03:26 down in the Gulf of Mexico. The stakes
00:03:26 --> 00:03:28 couldn't be higher for SpaceX as they work to
00:03:28 --> 00:03:31 demonstrate that starship can reliably reach
00:03:31 --> 00:03:34 orbit, a capability essential for
00:03:34 --> 00:03:37 NASA's Artemis programme and SpaceX's own
00:03:37 --> 00:03:40 ambitious plans for Mars. After nearly
00:03:40 --> 00:03:42 six months since the last test flight, all
00:03:42 --> 00:03:44 eyes will be on whether the third time's the
00:03:44 --> 00:03:46 charm for getting a ship past the critical
00:03:46 --> 00:03:47 engine cutoff milestone.
00:03:48 --> 00:03:51 Next Today, a deep space mystery.
00:03:52 --> 00:03:54 In an unexpected discovery that's reshaping
00:03:54 --> 00:03:56 our understanding of cosmic evolution,
00:03:56 --> 00:03:59 astronomers have identified a massive galaxy
00:03:59 --> 00:04:01 that stopped forming stars when the universe
00:04:01 --> 00:04:04 was merely 700 million years old, long before
00:04:04 --> 00:04:07 Earth even existed. This ancient galaxy, with
00:04:07 --> 00:04:09 the technical designation Ruby's UDS
00:04:09 --> 00:04:12 QGZ7, now holds the record as the
00:04:12 --> 00:04:15 most distant dead or quiescent galaxy ever
00:04:15 --> 00:04:17 confirmed. What makes this finding so
00:04:17 --> 00:04:20 remarkable is that galaxies typically need
00:04:20 --> 00:04:23 billions of years to grow large and then shut
00:04:23 --> 00:04:26 down their star formation. Yet here was
00:04:26 --> 00:04:28 this massive celestial structure that had
00:04:28 --> 00:04:30 already completed its life cycle in the
00:04:30 --> 00:04:33 universe's infancy. The powerful James
00:04:33 --> 00:04:35 Webb Space Telescope made this discovery
00:04:35 --> 00:04:38 possible, allowing astronomers to peer deeper
00:04:38 --> 00:04:40 into cosmic history than ever before. The
00:04:40 --> 00:04:43 galaxy managed to form an astonishing amount
00:04:43 --> 00:04:45 of stars in its brief active period, with
00:04:45 --> 00:04:47 stellar mass equivalent to more than 10
00:04:47 --> 00:04:50 billion suns. Then, for reasons
00:04:50 --> 00:04:51 astronomers are still trying to understand,
00:04:52 --> 00:04:55 it simply stopped. All star formations ceased
00:04:55 --> 00:04:57 completely, leaving behind what scientists
00:04:57 --> 00:05:00 call a, quenched galaxy. Data from
00:05:00 --> 00:05:02 Webb's Near Infrared Spectrograph confirmed
00:05:02 --> 00:05:04 this quiet state during observations
00:05:04 --> 00:05:07 conducted as part of the RUBIES survey that
00:05:07 --> 00:05:09 stands for Red Unknowns Bright Infrared
00:05:09 --> 00:05:12 Extragalactic Survey. The spectrum revealed
00:05:12 --> 00:05:15 no signs of ongoing star formation, instead
00:05:15 --> 00:05:17 showing strong balmar and calcium absorption
00:05:17 --> 00:05:20 features characteristic of older stellar
00:05:20 --> 00:05:23 populations. When astronomers determined its
00:05:23 --> 00:05:26 redshift of 7.29, they realised they
00:05:26 --> 00:05:28 were looking at a galaxy, as it appeared just
00:05:28 --> 00:05:30 a few hundred million years after the Big
00:05:30 --> 00:05:33 Bang. Further analysis suggests it had
00:05:33 --> 00:05:35 already stopped forming stars around 50 to
00:05:35 --> 00:05:37 100 million years before the light we're now
00:05:37 --> 00:05:40 detecting left the galaxy. This means it
00:05:40 --> 00:05:42 likely completed its entire star forming
00:05:42 --> 00:05:45 phase even before redshift 8, pushing our
00:05:45 --> 00:05:47 timeline of galaxy evolution into uncharted
00:05:47 --> 00:05:50 territory. The discovery challenges
00:05:50 --> 00:05:52 fundamental assumptions about how quickly
00:05:52 --> 00:05:54 galaxies can form and evolve in the early
00:05:54 --> 00:05:57 universe. Current theoretical models simply
00:05:57 --> 00:05:59 don't account for galaxies growing so large
00:05:59 --> 00:06:01 and then shutting down so rapidly in the
00:06:01 --> 00:06:03 cosmic dawn era. This finding
00:06:03 --> 00:06:06 suggests we may need to substantially revise
00:06:06 --> 00:06:08 our understanding of the processes driving
00:06:08 --> 00:06:11 galaxy formation and evolution in the
00:06:11 --> 00:06:13 universe's earliest epochs. What
00:06:13 --> 00:06:15 makes this discovery particularly remarkable
00:06:15 --> 00:06:18 is the galaxy's extremely compact nature.
00:06:18 --> 00:06:21 Despite its massive stellar content, Ruby's
00:06:21 --> 00:06:24 UDS QG Z7 measures just 650
00:06:24 --> 00:06:26 light years across. To put that in
00:06:26 --> 00:06:28 perspective, our, Milky Way galaxy spans
00:06:28 --> 00:06:31 approximately 100 light years.
00:06:31 --> 00:06:34 This incredible density makes it one of the
00:06:34 --> 00:06:37 most tightly packed galaxies ever observed.
00:06:38 --> 00:06:40 Scientists believe this ancient compact
00:06:40 --> 00:06:42 galaxy likely represents the core of what
00:06:42 --> 00:06:45 would eventually become the giant elliptical
00:06:45 --> 00:06:48 galaxies we see in today's universe. These
00:06:48 --> 00:06:50 modern ellipticals are among the largest and
00:06:50 --> 00:06:53 oldest galaxies we observe. Often found at
00:06:53 --> 00:06:55 the centres of galaxy clusters, the structure
00:06:55 --> 00:06:58 of Ruby's Udes QGZ7 closely resembles
00:06:58 --> 00:07:01 what we see in the central regions of these
00:07:01 --> 00:07:02 massive ellipticals in our cosmic
00:07:02 --> 00:07:05 neighbourhood. As Anna DeGraaf, lead
00:07:05 --> 00:07:06 investigator of the Rubies programme at the
00:07:06 --> 00:07:09 Max Planck Institute for Astronomy, explains,
00:07:10 --> 00:07:12 the discovery provides the first strong
00:07:12 --> 00:07:14 evidence that the centres of some nearby
00:07:14 --> 00:07:17 massive ellipticals may have already been in
00:07:17 --> 00:07:19 place since the first few hundred million
00:07:19 --> 00:07:22 years of the universe. The James
00:07:22 --> 00:07:24 Webb Space Telescope has been absolutely
00:07:24 --> 00:07:26 crucial in confirming this discovery.
00:07:27 --> 00:07:29 Previous telescopes like Hubble and ground
00:07:29 --> 00:07:31 based instruments simply couldn't see deep
00:07:31 --> 00:07:33 enough into the infrared spectrum to detect
00:07:33 --> 00:07:36 features like the Balmer break at such high
00:07:36 --> 00:07:38 redshifts. While the Spitzer Space
00:07:38 --> 00:07:40 Telescope offered some infrared capability,
00:07:41 --> 00:07:43 it lacked the resolution and sensitivity
00:07:43 --> 00:07:45 needed for definitive observations.
00:07:45 --> 00:07:48 Webb's revolutionary infrared capabilities
00:07:48 --> 00:07:50 have completely transformed our ability to
00:07:50 --> 00:07:51 study the early universe.
00:07:52 --> 00:07:55 Next up, a subject we keep returning to and
00:07:55 --> 00:07:57 with good reason. While NASA has been
00:07:57 --> 00:08:00 diligently tracking near Earth asteroids that
00:08:00 --> 00:08:01 could threaten our planet for the past two
00:08:01 --> 00:08:04 decades, recent research suggests we may have
00:08:04 --> 00:08:06 a significant blind spot in our Planetary
00:08:06 --> 00:08:08 Defence Strategy. Twenty years ago,
00:08:09 --> 00:08:12 Congress tasked NASA with finding 90% of near
00:08:12 --> 00:08:13 Earth asteroids that could pose a threat to
00:08:13 --> 00:08:15 Earth. And they've made considerable
00:08:15 --> 00:08:17 progress. However, astronomers are now
00:08:17 --> 00:08:20 discovering a new category of potentially
00:08:20 --> 00:08:22 hazardous objects that have largely escaped
00:08:22 --> 00:08:25 our attention. Asteroids CO orbiting with
00:08:25 --> 00:08:27 Venus. These Venus co orbital
00:08:27 --> 00:08:29 asteroids follow the same path around the sun
00:08:30 --> 00:08:32 as our neighbouring planet, but with a
00:08:32 --> 00:08:34 concerning twist. They can cross Earth's
00:08:34 --> 00:08:37 orbit. Currently, scientists have identified
00:08:37 --> 00:08:39 20 of these CO orbital asteroids. But new
00:08:39 --> 00:08:41 research indicates this may be just the tip
00:08:41 --> 00:08:44 of the cosmic iceberg. What makes these
00:08:44 --> 00:08:46 objects particularly concerning is their
00:08:46 --> 00:08:49 elusiveness. Many of these asteroids remain
00:08:49 --> 00:08:51 hidden in the sun's glare from our Earth
00:08:51 --> 00:08:54 based perspective, making them exceptionally
00:08:54 --> 00:08:56 difficult to detect with conventional survey
00:08:56 --> 00:08:59 methods. When the Venus co orbitals are
00:08:59 --> 00:09:00 positioned between Earth and the sun, they
00:09:00 --> 00:09:03 become virtually invisible to our telescopes,
00:09:03 --> 00:09:05 creating dangerous blind spots in our
00:09:05 --> 00:09:08 monitoring systems. Perhaps even more
00:09:08 --> 00:09:10 troubling is the unpredictable nature of
00:09:10 --> 00:09:12 their orbits. According to the research,
00:09:12 --> 00:09:15 these asteroids exhibit what scientists call
00:09:15 --> 00:09:17 highly chaotic orbital patterns with
00:09:17 --> 00:09:20 Lyapunov times of just 150 years.
00:09:20 --> 00:09:23 In astronomical terms, the Lyapunov time
00:09:23 --> 00:09:25 indicates how long it takes for an object's
00:09:25 --> 00:09:27 orbit to become unpredictable due to chaotic
00:09:27 --> 00:09:30 dynamics. This means that tracking these
00:09:30 --> 00:09:32 objects trajectories beyond a century and a
00:09:32 --> 00:09:34 half becomes extraordinarily challenging.
00:09:35 --> 00:09:37 Lead researcher Valerio Carruba from Sao
00:09:37 --> 00:09:40 Paulo University explains that co orbital
00:09:40 --> 00:09:42 status protects these asteroids from close
00:09:42 --> 00:09:45 approaches to Venus, but it does not protect
00:09:45 --> 00:09:47 them from encountering Earth. This creates a
00:09:47 --> 00:09:49 peculiar situation where objects that share
00:09:49 --> 00:09:52 Venus's orbit can potentially pose a greater
00:09:52 --> 00:09:54 threat to our planet than to Venus itself.
00:09:55 --> 00:09:57 The research team defines these objects as
00:09:57 --> 00:10:00 potentially hazardous if they have a minimum
00:10:00 --> 00:10:02 diameter of about 140 metres and
00:10:02 --> 00:10:05 come within 0.05 astronomical
00:10:05 --> 00:10:08 units of Earth's orbit. For context,
00:10:08 --> 00:10:11 an asteroid of this size striking Earth could
00:10:11 --> 00:10:13 release energy equivalent to hundreds of
00:10:13 --> 00:10:16 megatons of tnt, Thousands of times more more
00:10:16 --> 00:10:18 powerful than the atomic bombs used in World
00:10:18 --> 00:10:21 War II. Such an impact could devastate an
00:10:21 --> 00:10:24 entire metropolitan area. As we expand
00:10:24 --> 00:10:25 our understanding of these celestial
00:10:25 --> 00:10:28 dynamics, it's becoming clear that our
00:10:28 --> 00:10:30 planetary defence strategy may need
00:10:30 --> 00:10:33 significant recalibration to address this
00:10:33 --> 00:10:36 previously underestimated threat lurking
00:10:36 --> 00:10:38 in the orbit of our nearest planetary
00:10:38 --> 00:10:39 neighbour.
00:10:40 --> 00:10:42 In the early hours of May 25,
00:10:42 --> 00:10:45 SpaceX's Dragon capsule splashed down off
00:10:45 --> 00:10:48 the California coast, Successfully completing
00:10:48 --> 00:10:51 the company's 32nd commercial resupply
00:10:51 --> 00:10:53 mission to the International Space Station.
00:10:53 --> 00:10:56 The unpiloted spacecraft returned with an
00:10:56 --> 00:10:59 impressive haul. Approximately
00:10:59 --> 00:11:01 6 pounds of scientific
00:11:01 --> 00:11:04 equipment, supplies and experiments
00:11:04 --> 00:11:06 that had been conducted in the unique
00:11:06 --> 00:11:08 microgravity environment of the orbiting
00:11:08 --> 00:11:11 laboratory. This scientific treasure trove
00:11:11 --> 00:11:13 represents some of the most cutting edge
00:11:13 --> 00:11:16 research being conducted in space today. The
00:11:16 --> 00:11:18 Dragon undocked from the station's Harmony
00:11:18 --> 00:11:20 Module two days earlier before making its
00:11:20 --> 00:11:22 journey home, carrying cargo that could
00:11:22 --> 00:11:24 revolutionise everything from spacecraft
00:11:24 --> 00:11:27 design to satellite maintenance.
00:11:27 --> 00:11:30 Among the most fascinating returns was the
00:11:30 --> 00:11:33 Missy20 experiment. Short for Multipurpose
00:11:33 --> 00:11:36 International Space Station Experiment. This
00:11:36 --> 00:11:38 project tested various materials by exposing
00:11:38 --> 00:11:40 them directly to the harsh conditions of
00:11:40 --> 00:11:43 space. The samples included radiation
00:11:43 --> 00:11:46 shielding, solar Sail coatings, ceramic
00:11:46 --> 00:11:48 composites for re entry vehicles and
00:11:48 --> 00:11:50 specialised resins that might one day form
00:11:50 --> 00:11:52 the basis of improved heat shields
00:11:53 --> 00:11:55 mounted on the exterior of the station. These
00:11:55 --> 00:11:58 materials endured extreme conditions that
00:11:58 --> 00:12:00 can't be replicated on Earth. Ultraviolet
00:12:00 --> 00:12:03 radiation, atomic oxygen charged
00:12:03 --> 00:12:05 particles and dramatic temperature swings
00:12:05 --> 00:12:07 that would destroy most conventional
00:12:07 --> 00:12:10 materials. By analysing how these
00:12:10 --> 00:12:12 samples performed, scientists can better
00:12:12 --> 00:12:15 design spacecraft and satellites to withstand
00:12:15 --> 00:12:16 the unforgiving environment beyond our
00:12:16 --> 00:12:19 atmosphere. Perhaps the most visually
00:12:19 --> 00:12:21 striking experiment returning to Earth was
00:12:22 --> 00:12:24 Astrobreacch,
00:12:24 --> 00:12:27 which stands for Responsive Engaging Arms for
00:12:27 --> 00:12:29 Captive care and handling. This innovative
00:12:29 --> 00:12:31 technology demonstrated something that sounds
00:12:31 --> 00:12:33 straight out of science fiction. Robotic
00:12:33 --> 00:12:35 tentacle like arms capable of grasping and
00:12:35 --> 00:12:38 relocating objects in space. The
00:12:38 --> 00:12:40 system used specialised adhesive pads to
00:12:40 --> 00:12:42 capture items of different shapes and surface
00:12:42 --> 00:12:45 materials. This capability represents a
00:12:45 --> 00:12:47 major step forward in addressing one of the
00:12:47 --> 00:12:50 growing challenges in Earth orbit. Safely
00:12:50 --> 00:12:52 capturing and relocating debris and defunct
00:12:52 --> 00:12:55 satellites. Such technology could eventually
00:12:55 --> 00:12:57 help extend satellite lifespans through in
00:12:57 --> 00:13:00 orbit servicing and potentially reduce the
00:13:00 --> 00:13:02 hazardous debris field that increasingly
00:13:02 --> 00:13:03 threatens spacecraft operations.
00:13:04 --> 00:13:06 The Dragon's cargo also included some more
00:13:06 --> 00:13:09 whimsical but no less important items.
00:13:09 --> 00:13:11 Books from the Storytime From Space project
00:13:11 --> 00:13:14 are returning after orbiting the Earth. This
00:13:14 --> 00:13:16 educational initiative featured astronauts
00:13:16 --> 00:13:18 reading science and mathematics related
00:13:18 --> 00:13:20 children's books while floating in zero
00:13:20 --> 00:13:22 gravity. The crew also recorded
00:13:22 --> 00:13:25 themselves performing science demonstrations
00:13:25 --> 00:13:27 that corresponded with the book's themes. All
00:13:27 --> 00:13:29 these videos have been made available in an
00:13:29 --> 00:13:32 online library with accompanying educational
00:13:32 --> 00:13:35 materials inspiring the next generation of
00:13:35 --> 00:13:37 space explorers. Additionally,
00:13:37 --> 00:13:39 hardware and data from a one year technology
00:13:40 --> 00:13:43 demonstration called Optica onboard
00:13:43 --> 00:13:45 programmable technology for image compression
00:13:45 --> 00:13:48 and analysis made the journey home. This
00:13:48 --> 00:13:50 advanced imaging system was designed to
00:13:50 --> 00:13:52 revolutionise how we transmit ultra high
00:13:52 --> 00:13:55 resolution hyperspectral imagery from space
00:13:55 --> 00:13:57 to Earth in real time, potentially
00:13:57 --> 00:13:59 transforming everything from disaster
00:13:59 --> 00:14:01 response to environmental monitoring.
00:14:02 --> 00:14:04 Together, these returning experiments
00:14:04 --> 00:14:06 showcase how the International Space Station
00:14:06 --> 00:14:09 continues to serve as humanity's premier
00:14:09 --> 00:14:12 orbital laboratory. Developing technologies
00:14:12 --> 00:14:14 that not only advance space exploration, but
00:14:14 --> 00:14:16 also deliver tangible benefits to life on
00:14:16 --> 00:14:19 Earth. To wrap
00:14:19 --> 00:14:22 up today, let's look at a solution to a great
00:14:22 --> 00:14:24 scientific mystery that's finally been
00:14:24 --> 00:14:24 sorted.
00:14:25 --> 00:14:27 We finally have an answer to one of
00:14:27 --> 00:14:29 cosmology's biggest mysteries. What
00:14:29 --> 00:14:32 switched on the lights in our early universe?
00:14:32 --> 00:14:35 For decades, astronomers have been puzzled by
00:14:35 --> 00:14:37 how our universe transitioned from a dark
00:14:37 --> 00:14:40 opaque fog to the transparent cosmos we
00:14:40 --> 00:14:43 observe today. The answer, it turns out, is
00:14:43 --> 00:14:45 surprisingly small. According to
00:14:45 --> 00:14:47 groundbreaking new data from the Hubble and
00:14:47 --> 00:14:50 James Webb space telescopes, it was tiny
00:14:50 --> 00:14:53 dwarf galaxies that cleared the primordial
00:14:53 --> 00:14:55 fog of neutral hydrogen filling intergalactic
00:14:55 --> 00:14:58 space after the Big Bang. In the
00:14:58 --> 00:15:00 beginning the universe was filled with a hot,
00:15:00 --> 00:15:02 dense plasma that scattered light,
00:15:03 --> 00:15:05 effectively making everything dark. As it
00:15:05 --> 00:15:08 cooled, protons and electrons combined to
00:15:08 --> 00:15:11 form neutral hydrogen gas. While this
00:15:11 --> 00:15:13 gas allowed some wavelengths of light to pass
00:15:13 --> 00:15:15 through, there weren't many light sources
00:15:15 --> 00:15:17 around to illuminate the cosmos. That
00:15:17 --> 00:15:20 changed with the birth of the first stars.
00:15:20 --> 00:15:22 Their radiation was strong enough to strip
00:15:22 --> 00:15:25 electrons from hydrogen atoms, reionizing the
00:15:25 --> 00:15:27 gas and making the universe transparent to
00:15:27 --> 00:15:30 light. By about 1 billion years after the
00:15:30 --> 00:15:33 Big Bang, the period known as cosmic dawn,
00:15:33 --> 00:15:35 the universe was fully reionized.
00:15:36 --> 00:15:38 Scientists had long assumed that the primary
00:15:38 --> 00:15:40 drivers of this reionization must have been
00:15:40 --> 00:15:43 powerful sources, supermassive black holes,
00:15:43 --> 00:15:46 or massive star forming galaxies. But the
00:15:46 --> 00:15:48 Webb Telescope's unprecedented sensitivity
00:15:48 --> 00:15:51 has revealed a different story. By examining
00:15:51 --> 00:15:52 a galaxy cluster called
00:15:52 --> 00:15:55 Abel2744, which
00:15:55 --> 00:15:57 acts as a cosmic magnifying glass, through
00:15:57 --> 00:16:00 gravitational lensing, researchers were able
00:16:00 --> 00:16:03 to detect extremely faint dwarf galaxies near
00:16:03 --> 00:16:05 the cosmic dawn. Their analysis revealed
00:16:05 --> 00:16:08 something astonishing. These dwarf galaxies
00:16:08 --> 00:16:11 outnumber larger galaxies by a ratio of 100
00:16:11 --> 00:16:13 to 1. Even more surprisingly, these
00:16:13 --> 00:16:16 tiny galaxies collectively emit four times
00:16:16 --> 00:16:18 more ionising radiation than previously
00:16:18 --> 00:16:21 assumed from larger galaxies. Despite their
00:16:21 --> 00:16:24 diminutive size, they were extraordinarily
00:16:24 --> 00:16:26 efficient at producing the high energy
00:16:26 --> 00:16:28 photons needed to clear the cosmic fog.
00:16:29 --> 00:16:32 As astrophysicist Hakim Atek described them,
00:16:32 --> 00:16:34 these galaxies were truly cosmic
00:16:34 --> 00:16:37 powerhouses whose abundance and collective
00:16:37 --> 00:16:39 energy output was substantial enough to
00:16:39 --> 00:16:41 transform the entire state of the universe.
00:16:42 --> 00:16:44 It's a case where quantity truly overcame
00:16:44 --> 00:16:46 quality. Their sheer numbers compensated for
00:16:46 --> 00:16:49 their individual small size. This discovery
00:16:49 --> 00:16:51 fundamentally changes our understanding of
00:16:51 --> 00:16:53 how the universe evolved from darkness to
00:16:53 --> 00:16:56 light, highlighting how even the smallest
00:16:56 --> 00:16:58 cosmic structures can drive the most profound
00:16:58 --> 00:17:00 transformations in our universe's history.
00:17:01 --> 00:17:03 If confirmed across multiple observations,
00:17:03 --> 00:17:06 this discovery represents one of the most
00:17:06 --> 00:17:07 significant breakthroughs in our
00:17:07 --> 00:17:10 understanding of cosmic evolution. It
00:17:10 --> 00:17:12 suggests that the universe's most
00:17:12 --> 00:17:14 transformative processes weren't necessarily
00:17:14 --> 00:17:17 driven by the largest, most spectacular
00:17:17 --> 00:17:20 objects, but by the collective influence
00:17:20 --> 00:17:23 of countless smaller ones. A profound
00:17:23 --> 00:17:25 lesson about how even the smallest entities
00:17:25 --> 00:17:27 can collectively drive the most fundamental
00:17:27 --> 00:17:29 changes in our universe.
00:17:30 --> 00:17:32 And that's it for today's episode. Thanks for
00:17:32 --> 00:17:34 joining me on Astronomy Daily. I'm Anna
00:17:34 --> 00:17:36 reminding you to visit us at astronomydaily
00:17:37 --> 00:17:39 IO, where you can find all of today's news
00:17:39 --> 00:17:41 and all things Astronomy Daily. And of
00:17:41 --> 00:17:43 course, remember to subscribe to the free
00:17:43 --> 00:17:45 podcast available on all podcast
00:17:45 --> 00:17:48 platforms. I'll see you tomorrow for more
00:17:48 --> 00:17:50 fascinating developments from the final
00:17:50 --> 00:17:52 frontier. Until then, do as I do.
00:17:53 --> 00:17:53 Keep looking up.