エピソード

  • Artemis II Preparations, Jellyfish Galaxy, and Mars' Celestial Dance

    Artemis II Preparations, Jellyfish Galaxy, and Mars' Celestial Dance
    2025/06/14
    Highlights:
    - Artemis II Preparations: In this episode, we explore the recent collaboration between NASA and the Department of Defence as they conduct emergency simulations for the Artemis II mission. With plans to send four astronauts around the Moon next year, these crucial rehearsals focus on ensuring crew safety during potential launch emergencies, including realistic scenarios using test mannequins.
    - ISS Update: We provide an update on the AX-4 mission delay, with good news from the Russian space agency Roscosmos, confirming that a leak on the International Space Station has been repaired. However, the impact on the prospective launch date remains uncertain.
    - Jellyfish Galaxy Discovery: Astronomers have discovered a fascinating galaxy, NGC 4858, which resembles a jellyfish with bunny ears. Situated over 300 million light years away, this galaxy is undergoing extreme pressure within the Coma cluster, leading to its unique shape and the phenomenon of fallback.
    - Spotting Mars: Get ready for some celestial excitement as we guide you on how to spot Mars this month. From its close encounters with Regulus to a beautiful crescent Moon passing by, we provide tips on when and where to look in the western sky.
    - International Space Development Conference: We discuss the upcoming ISDC 2025 in Orlando, Florida, where space enthusiasts will gather to discuss global collaboration in space exploration, sustainability, and planetary defence strategies, featuring notable speakers from the field.
    - Dark Matter Insights: Lastly, we delve into the upcoming Nancy Chris Roman Space Telescope, set to launch in 2026. This telescope aims to enhance our understanding of dark matter through gravitational lensing, potentially providing crucial insights into this enigmatic substance and its role in the universe.
    For more cosmic updates, visit our website at astronomydaily.io. Join our community on social media by searching for #AstroDailyPod on Facebook, X, YouTube Music, 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 - Artemis 2 preparations
    10:00 - ISS update
    15:30 - Jellyfish galaxy discovery
    20:00 - Spotting Mars
    25:00 - International Space Development Conference
    30:00 - Dark matter insights
    ✍️ Episode References
    NASA Artemis Updates
    [NASA](https://www.nasa.gov/)
    AX-4 Mission Information
    [Roscosmos](https://www.roscosmos.ru/)
    NGC 4858 Research
    [Astronomy Journal](https://www.astronomy.com/)
    Mars Observation Tips
    [Sky & Telescope](https://skyandtelescope.org/)
    ISDC 2025 Information
    [ISDC](https://isdc2025.org/)
    Nancy Chris Roman Space Telescope
    [NASA Roman](https://roman.gsfc.nasa.gov/)
    Astronomy Daily
    [Astronomy Daily](http://www.astronomydaily.io/)

    Become a supporter of this podcast: https://www.spreaker.com/podcast/astronomy-daily-exciting-space-discoveries-and-news--5648921/support.
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    10 分
  • Axiom Mission Delays, Cosmic Clouds Unveiled, and Mars' Terraforming Blueprint

    Axiom Mission Delays, Cosmic Clouds Unveiled, and Mars' Terraforming Blueprint
    2025/06/13
    Highlights:
    - Axiom Mission Delay: In this episode, we discuss the indefinite postponement of the Axiom Space AX-4 mission to the International Space Station, caused by a newly detected air leak in the Russian Zvezda module. NASA and Roscosmos are working diligently to investigate the situation, ensuring the safety of future missions.
    - SpaceX Starship Flight 8 Investigation: The FAA has concluded its investigation into the SpaceX Starship Flight 8 mishap, attributing the incident to a hardware failure. We review the corrective measures implemented by SpaceX ahead of their Flight 9 mission and what this means for the future of space exploration.
    - Discovery of a Massive Cosmic Cloud: Astronomers have uncovered a colossal cloud of energetic particles enveloping a galaxy cluster, stretching over 20 million light years. This astonishing find challenges existing theories about particle energisation over vast distances, prompting a re-evaluation of our understanding of the universe.
    - Ancient Lunar Glass Beads: Explore the fascinating discovery of tiny orange glass beads on the Moon, remnants of ancient volcanic eruptions. New research is uncovering their secrets, providing insights into the Moon's volcanic history and its geological evolution over billions of years.
    - The Teenage Vampire Star: Meet Gaia22ayj, a white dwarf star engaging in a unique "vampiric" behaviour by feeding on plasma from a companion star. This discovery offers significant clues to the life cycle of white dwarfs and the dynamics of binary star systems.
    - Terraforming Mars: Scientists unveil an ambitious three-phase plan to terraform Mars, aiming to transform the Red Planet into a habitable environment. From warming the planet to introducing engineered organisms, this long-term vision could reshape our understanding of planetary ecosystems and benefit Earth in the process.
    For more cosmic updates, visit our website at astronomydaily.io. Join our community on social media by searching for #AstroDailyPod on Facebook, X, YouTube Music, 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 - Axiom mission delay
    10:00 - SpaceX Starship Flight 8 investigation
    15:30 - Discovery of a massive cosmic cloud
    20:00 - Ancient lunar glass beads
    25:00 - The teenage vampire star
    30:00 - Terraforming Mars
    ✍️ Episode References
    Axiom Space Mission Updates
    [NASA](https://www.nasa.gov/)
    SpaceX Starship Investigation
    [SpaceX](https://www.spacex.com/)
    Cosmic Cloud Discovery
    [Astronomy Journal](https://www.astronomy.com/)
    Lunar Glass Beads Research
    [Lunar Science Institute](https://www.lunarscience.org/)
    Gaia22ayj Discovery
    [Astrophysical Journal](https://iopscience.iop.org/journal/0004-637X)
    Terraforming Mars Research
    [Mars Society](https://www.marssociety.org/)
    Astronomy Daily
    [Astronomy Daily](http://www.astronomydaily.io/)

    Become a supporter of this podcast: https://www.spreaker.com/podcast/astronomy-daily-exciting-space-discoveries-and-news--5648921/support.
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    7 分
  • Satellites Under Solar Siege, First Looks at the Sun's Poles, and Black Hole Secrets

    Satellites Under Solar Siege, First Looks at the Sun's Poles, and Black Hole Secrets
    2025/06/12
    Highlights:
    - Solar Storms and Satellite Impact: In this episode, we delve into the effects of solar storms on our satellites, revealing how geomagnetic storms can accelerate orbital decay. Discover insights from researcher Yoshita Barua on how different types of solar events impact satellite performance and how we can design more resilient spacecraft to withstand these cosmic tempests.
    - First Look at the Sun's Poles: Join us as we celebrate a monumental achievement from the European Space Agency's Solar Orbiter, which has provided humanity's first images of the Sun's poles. These groundbreaking visuals offer new perspectives on solar magnetic fields and the dynamics of solar plasma, shedding light on the Sun's complex behaviour.
    - Unpacking Black Holes: Prepare for a mind-bending discussion on the mysteries of black holes. We explore recent theories attempting to resolve the singularity conundrum, including the controversial idea that black holes may spawn new universes. Could this be the key to understanding the enigmatic interiors of these cosmic giants?
    - SpaceX's Starship Ambitions: Get the latest updates on SpaceX's Starship programme, with exciting developments in Florida as the company prepares for ambitious launch plans. We discuss the implications of the newly released draft Environmental Impact Statement and what it means for future space exploration.
    - Uranus's Rusty Moons: Finally, we investigate intriguing new findings about Uranus's moons, which are accumulating dust from tiny meteorite impacts. Discover how this phenomenon challenges previous assumptions about the moons' surface characteristics and the potential role of Uranus's magnetic field.
    For more cosmic updates, visit our website at astronomydaily.io. Join our community on social media by searching for #AstroDailyPod on Facebook, X, YouTube Music, 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 - Solar storms and satellite impact
    10:00 - First look at the Sun's poles
    15:30 - Unpacking black holes
    20:00 - SpaceX's Starship ambitions
    25:00 - Uranus's dusty moons
    ✍️ Episode References
    Solar Storms Research
    [ESA](https://www.esa.int/)
    Solar Orbiter Discoveries
    [Solar Orbiter](https://www.esa.int/Science_Exploration/Space_Science/Solar_Orbiter)
    Black Hole Theories
    [Physics Today](https://www.physicstoday.org/)
    SpaceX Starship Updates
    [SpaceX](https://www.spacex.com/)
    Uranus's Moons Research
    [Hubble Space Telescope](https://hubblesite.org/)
    Astronomy Daily
    [Astronomy Daily](http://www.astronomydaily.io/)

    Become a supporter of this podcast: https://www.spreaker.com/podcast/astronomy-daily-exciting-space-discoveries-and-news--5648921/support.
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    13 分
  • SpaceX Ax-4 Mission Delay, Satellite Paint Breakthroughs, and James Webb's Breathtaking Revelations

    SpaceX Ax-4 Mission Delay, Satellite Paint Breakthroughs, and James Webb's Breathtaking Revelations
    2025/06/11
    Highlights:
    - SpaceX AX-4 Mission Delay: Join us as we discuss the recent postponement of the SpaceX AX-4 mission to the International Space Station due to a liquid oxygen leak detected in the Falcon 9 rocket. We delve into the implications of this delay and the crew's groundbreaking mission, commanded by record-breaking astronaut Peggy Whitson, as they prepare for their two-week stay aboard the ISS.
    - Stellar Launch Activity: Discover the bustling launch schedule from SpaceX, including the celebration of their 500th Falcon rocket launch and the upcoming missions for Starlink and Rocket Lab. We highlight the ambitious plans of Amazon's Project Kuiper and the ongoing advancements in satellite technology.
    - Revolutionary Vantablack 310: Learn about the newly developed Vantablack 310, a super black paint that could significantly reduce satellite light pollution. This innovation aims to protect astronomical observations from the disruptive effects of mega-constellations, making satellites virtually invisible to the naked eye.
    - Stunning JWST Exoplanet Discoveries: Be amazed by the latest breathtaking images from the James Webb Space Telescope, revealing clouds of sand on exoplanet YSES 1c and a swirling disc of olivine around YSES 1b. These findings offer profound insights into the atmospheres of distant worlds and hint at potential cosmic events.
    - China's Orbital Refuelling Test: We explore China's upcoming orbital refuelling test involving the Shijian satellites, a significant step towards servicing and extending the lifespan of satellites in orbit. This development has strategic implications for both commercial and military applications.
    For more cosmic updates, visit our website at astronomydaily.io. Join our community on social media by searching for #AstroDailyPod on Facebook, X, YouTube Music, 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 AX-4 mission delay
    10:00 - Stellar launch activity
    15:30 - Revolutionary Vantablack 310
    20:00 - Stunning JWST exoplanet discoveries
    25:00 - China's orbital refuelling test
    ✍️ Episode References
    SpaceX AXE 4 Mission Updates
    [SpaceX](https://www.spacex.com/)
    Vantablack 310 Research
    [Vantablack](https://www.vantablack.com/)
    JWST Exoplanet Discoveries
    [NASA JWST](https://www.nasa.gov/mission_pages/webb/main/index.html)
    China's Shijian Satellites
    [China National Space Administration](http://www.cnsa.gov.cn/)
    Astronomy Daily
    [Astronomy Daily](http://www.astronomydaily.io/)
    For Commercial-Free versions become a supporter of this podcast: https://www.spreaker.com/podcast/astronomy-daily-exciting-space-discoveries-and-news--5648921/support.
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    10 分
  • Space Travel Revolution, Lunar Impact Risks, and Infinite Energy in the Cosmos

    Space Travel Revolution, Lunar Impact Risks, and Infinite Energy in the Cosmos
    2025/06/10
    Highlights:
    - Europe's Nuclear-Powered Space Travel: Join us as we explore the European Space Agency's exciting plans for nuclear propulsion technology that could revolutionise space travel. This innovative approach aims to reduce the journey to Mars from nine months to just four or five, while also minimising harmful radiation exposure for astronauts. Discover how this technology could pave the way for a new era in space exploration.
    - Asteroid 2024 YR4's Lunar Encounter: We discuss the latest updates on asteroid 2024 YR4, which now has a slightly increased chance of impacting the Moon in 2032. With predictions refined by the James Webb Space Telescope, we delve into the implications of this potential encounter and what it means for planetary defence efforts.
    - Commercial Launches from Sardinia: Exciting developments in the commercial space sector as Italian company OLM M plans to conduct launch services from Sardinia. With a new rocket named Starlight, designed for suborbital missions, we look at the historical significance of the launch site and what this means for future space endeavours.
    - Discovery of Giant Radio Galaxies: Prepare to be amazed as astronomers unveil 15 newly discovered giant radio galaxies, the largest single objects in the universe. We discuss their immense sizes and unique structures, shedding light on the behaviour of supermassive black holes and the cosmic processes that lead to the formation of these colossal entities.
    - Infinite Energy in the Vacuum of Space: Dive into the mind-bending concept of zero-point energy, where quantum fields contain infinite energy even in their lowest state. We explore the implications of this theory and why, despite its existence, this energy remains inaccessible for practical use.
    For more cosmic updates, visit our website at astronomydaily.io. Join our community on social media by searching for #AstroDailyPod on Facebook, X, YouTube Music, 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 - Europe's nuclear-powered space travel
    10:00 - Asteroid 2024 YR4's lunar encounter
    15:30 - Commercial launches from Sardinia
    20:00 - Discovery of giant radio galaxies
    25:00 - Infinite energy in the vacuum of space
    ✍️ Episode References
    European Space Agency Nuclear Propulsion Plans
    [ESA](https://www.esa.int/)
    Asteroid 2024 YR4 Updates
    [NASA](https://www.nasa.gov/)
    OLM M Commercial Launches
    [OLM M](https://www.olm-m.com/)
    Giant Radio Galaxy Discoveries
    [Australian Square Kilometre Array Pathfinder](https://www.astronomy.com/news/2023/10/scientists-discover-15-new-giant-radio-galaxies)
    Zero-Point Energy Concept
    [Quantum Field Theory](https://www.sciencedirect.com/topics/physics-and-astronomy/quantum-field-theory)
    Astronomy Daily
    [Astronomy Daily](http://www.astronomydaily.io/)
    For Commercial-Free versions become a supporter of this podcast: https://www.spreaker.com/podcast/astronomy-daily-exciting-space-discoveries-and-news--5648921/support.
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    9 分
  • Planet Nine's Potential, Milky Way's Future, and SpaceX's Dramatic Feud

    Planet Nine's Potential, Milky Way's Future, and SpaceX's Dramatic Feud
    2025/06/09
    Highlights:
    - Possible Ninth Planet Discovery: Join us as we explore a groundbreaking study from astronomers at the University of Taiwan who may have uncovered clues to the existence of a ninth planet in our solar system. This potential ice giant, located between 46.5 and 65.1 billion miles from the Sun, could take between 10,000 and 20,000 years to complete an orbit. With its mass estimated at 7/17 that of Earth, this discovery raises intriguing questions about the dynamics of our celestial neighborhood and the Kuiper Belt anomalies that led to its identification.
    - New Insights on Milky Way and Andromeda Collision: Delve into the latest research that challenges the long-held belief of an impending collision between the Milky Way and Andromeda galaxies. A study led by Till Swahala reveals that there is only a 50% chance of this merger occurring within the next 10 billion years, suggesting a more complex gravitational interplay with nearby galaxies. This new perspective reshapes our understanding of the future of our galaxy and the potential outcomes of such cosmic events.
    - Elon Musk's SpaceX Drama: Discover the latest twists in the ongoing saga between Elon Musk and Donaldjohanson Trump, as Musk threatened to decommission SpaceX's Dragon spacecraft amidst a public feud. This drama raises concerns about NASA's reliance on SpaceX for crewed missions to the International Space Station, highlighting the precarious balance of power in the evolving landscape of commercial spaceflight.
    - Boeing's Starliner Program Delays: We take a closer look at the uncertain future of Boeing's CST-100 Starliner spacecraft, which faces delays in its next flight, now pushed to early 2026. With lingering technical issues and the potential for an uncrewed mission, the fate of the Starliner program remains in limbo, leaving many questions about its role in NASA's future plans.
    For more cosmic updates, visit our website at astronomydaily.io. Join our community on social media by searching for #AstroDailyPod on Facebook, X, YouTube Music Music, 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 Steve Dunkley 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 - Possible ninth planet discovery
    10:00 - New insights on Milky Way and Andromeda collision
    15:30 - Elon Musk's SpaceX drama
    20:00 - Boeing's Starliner program delays
    ✍️ Episode References
    Ninth Planet Discovery Study
    [University of Taiwan](https://www.ntu.edu.tw/)
    Milky Way and Andromeda Research
    [Nature Astronomy](https://www.nature.com/natureastronomy/)
    Elon Musk and SpaceX Updates
    [SpaceX](https://www.spacex.com/)
    Boeing Starliner Updates
    [NASA Boeing](https://www.nasa.gov/boeing)
    Astronomy Daily
    [Astronomy Daily](http://www.astronomydaily.io/)
    For Commercial-Free versions become a supporter of this podcast: https://www.spreaker.com/podcast/astronomy-daily-exciting-space-discoveries-and-news--5648921/support.
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    20 分
  • Cosmic Wobbles, Monster Galaxies, and the Future of Space Exploration

    Cosmic Wobbles, Monster Galaxies, and the Future of Space Exploration
    2025/06/07
    Highlights:
    - Titan's Wobbling Atmosphere: Join us as we uncover the intriguing discovery that Titan, Saturn's largest moon, has a wobbling atmosphere. Recent studies analysing infrared light over 13 years reveal that Titan's atmosphere shifts with the seasons, raising questions about the forces at play. This research is vital for the upcoming Dragonfly mission in 2034, which aims to land on Titan and explore its unique atmospheric conditions.
    - Discovery of an Ancient Monster Galaxy: Travel back 11.1 billion years to explore the newly discovered super active spiral galaxy, J0107A. This ancient "monster galaxy" is rapidly forming stars and offers insights into the evolution of galaxies like our Milky Way. With features that were previously unpredicted by theoretical models, this discovery is reshaping our understanding of galactic formation in the early universe.
    - Delays in Boeing's Starliner Programme: We delve into the ongoing delays plaguing Boeing's Starliner programme, which has now pushed the next flight to early 2026. With lingering issues related to helium leaks and propulsion anomalies, NASA and Boeing are working to resolve these challenges before the next crewed mission can take place, leaving many questions unanswered.
    - The Royal Society's Vision for Space in 50 Years: Get a glimpse into the future with the Royal Society's report on space activities in 2075, envisioning asteroid mining, space factories, and interplanetary exploration. This bold vision highlights the potential for clean energy and recycling in space, while also addressing ethical challenges and the quest for alien life.
    For more cosmic updates, visit our website at astronomydaily.io. Join our community on social media by searching for #AstroDailyPod on Facebook, X, YouTube Music, 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 - Titan's wobbling atmosphere
    10:00 - Discovery of ancient monster galaxy J0107A
    15:30 - Delays in Boeing's Starliner programme
    20:00 - The Royal Society's vision for space in 50 years
    ✍️ Episode References
    Titan's Atmosphere Research
    [NASA Titan Studies](https://www.nasa.gov/)
    Ancient Monster Galaxy Discovery
    [Astrophysical Journal](https://iopscience.iop.org/journal/0004-637X)
    Boeing Starliner Updates
    [NASA Boeing](https://www.nasa.gov/boeing)
    Royal Society Robert on Space 2075
    [Royal Society](https://royalsociety.org/)
    Astronomy Daily
    [Astronomy Daily](http://www.astronomydaily.io/)
    For Commercial-Free versions become a supporter of this podcast: https://www.spreaker.com/podcast/astronomy-daily-exciting-space-discoveries-and-news--5648921/support.
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    8 分
  • Lunar Landing Woes, Elon Musk's Spat, and the Discovery of Extreme Nuclear Transients

    Lunar Landing Woes, Elon Musk's Spat, and the Discovery of Extreme Nuclear Transients
    2025/06/06
    Highlights:
    - Ispace's Lunar Landing Setback: Join us as we delve into the unfortunate news surrounding Ispace's Resilience lander, which failed to achieve a successful landing on the Moon. After launching aboard a Falcon 9 rocket, the mission suffered a hard landing, resulting in lost communication. We discuss the implications of this setback and the company's plans for future missions, including their contract with NASA for a 2027 lunar delivery.
    - Musk vs. Trump: A Space Tiff: Explore the escalating tensions between Elon Musk and Donald Trump following Musk's criticism of Trump's policies. With Musk threatening to decommission SpaceX's Dragon spacecraft, we examine the potential consequences for American spaceflight and NASA's operations, particularly in light of SpaceX's crucial contracts.
    - Mars Rover's Mysterious Maze: Uncover the fascinating purpose behind the maze captured in images by NASA's Perseverance rover. This calibration target for the rover's Sherlock instrument plays a vital role in detecting organic compounds on Mars, while also testing materials for future human exploration.
    - Discovery of Extreme Nuclear Transients: Get ready for a mind-blowing revelation as astronomers unveil extreme nuclear transients (ENTs), the largest explosions observed since the Big Bang. These colossal events, linked to the destruction of massive stars by black holes, offer new insights into black hole growth and cosmic history.
    For more cosmic updates, visit our website at astronomydaily.io. Join our community on social media by searching for #AstroDailyPod on Facebook, X, YouTube Music, 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 - Ispace's lunar landing setback
    10:00 - Musk vs. Trump: A space tiff
    15:30 - Mars rover's mysterious maze
    20:00 - Discovery of extreme nuclear transients
    ✍️ Episode References
    Ispace Resilience Mission Details
    [ISPACE](https://ispace-inc.com/)
    Elon Musk and Donald Trump Dispute
    [CNN](https://www.cnn.com)
    NASA Perseverance Rover Information
    [NASA Perseverance](https://mars.nasa.gov/perseverance/)
    Extreme Nuclear Transients Research
    [Astrophysical Journal](https://iopscience.iop.org/journal/0004-637X)
    Astronomy Daily
    [Astronomy Daily](http://www.astronomydaily.io/)
    For Commercial-Free versions become a supporter of this podcast: https://www.spreaker.com/podcast/astronomy-daily-exciting-space-discoveries-and-news--5648921/support.
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    9 分