GreenSpacealien — Quiet Cosmos

GreenSpacealien
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Slow down and explore the universe with GreenSpacealien - Quiet Cosmos. Calm, chaptered astronomy documentaries journey through stars, black holes, planets and the space systems shaping everyday life. Follow the evidence, learn or unwind with Calm Space to Fall Asleep To. Watch our documentaries, discover original science Shorts and find every social profile: https://www.youtube.com/@GreenSpacealien15 Choose Spotify or your favourite podcast app: https://creators.spotify.com/pod/profile/greenspacealien15/

  1. 1d ago

    Apollo 13: How the Crew Got Home

    Apollo 13's planned Moon landing was abandoned after an oxygen-tank failure disabled the spacecraft's normal power source. This video follows the recovery in sequence: the first burn restored a free-return path, a guidance-alignment check preceded the later PC+2 burn that shortened the return, and the crew used the Lunar Module as a lifeboat while the ground team worked through power, water and carbon-dioxide problems. The story ends with the crew returning to Odyssey for Earth entry and splashdown. Original reconstructions illustrate the mission; the cause section follows the later Review Board investigation, rather than what the crew knew during the emergency. Chapters 00:00 Power Loss and the First Burn 03:28 Guidance Check and a Shorter Trip 06:56 Back in Odyssey and Home Music: original score created for this GreenSpacealien video, with no third-party recordings or samples. Sources and further reading NASA — Apollo 13 Mission Report (1970) https://ntrs.nasa.gov/api/citations/19710003598/downloads/19710003598.pdf NASA — Apollo 13 Mission Summary https://www.nasa.gov/wp-content/uploads/static/history/SP-4029/Apollo_13a_Summary.htm NASA — Apollo 13 Press Kit https://www.nasa.gov/wp-content/uploads/static/history/alsj/a13/Apollo13_PressKit_restored.pdf NASA — Apollo 13 Technical Air-to-Ground Transcript https://www.nasa.gov/wp-content/uploads/2026/01/as13-tec.pdf NASA — Apollo 13 Review Board report https://ntrs.nasa.gov/api/citations/20170000913/downloads/20170000913.pdf Historical photograph credit: NASA/JSC, AS13-62-8929 — the Lunar Module carbon-dioxide "mailbox" adapter. Find us on: YouTube: https://www.youtube.com/watch?v=itSirpbhSss Facebook: https://www.facebook.com/profile.php?id=61594406836899 Instagram: https://www.instagram.com/greenbigspacealien15/ X: https://x.com/GreenSpacealie TikTok: https://www.tiktok.com/@greenbigspace15 Reddit: https://www.reddit.com/r/GreenSpacealien15/ Dailymotion: https://www.dailymotion.com/user/green.hbw590 Pinterest: https://www.pinterest.com/greenbigspacealien15/ Rumble: https://rumble.com/user/greenspacealien15 Threads: https://www.threads.com/@greenbigspacealien15 Bluesky: https://bsky.app/profile/greenspacealien15.bsky.social

  2. 2d ago

    How Does a Spacesuit Keep You Alive?

    Using the International Space Station's Extravehicular Mobility Unit (EMU) as its reference, this video follows the systems that support a spacewalk: pressure, oxygen supply, breathing-gas circulation and carbon-dioxide removal, cooling, protective layers, and movement. It also separates the circulating water in the cooling garment from the feedwater the sublimator consumes to carry heat out of the suit. Supplies and operating limits depend on the mission and configuration. Launch/entry suits and other exploration systems can differ. Sections 00:00 Pressure, Oxygen, and Breathing 02:05 Cooling, Protection, and Supplies Music: original score created for this GreenSpacealien video, with no third-party recordings or samples. Sources and further reading NASA — Spacewalk Spacesuit Basics https://www.nasa.gov/centers-and-facilities/johnson/spacewalk-spacesuit-basics/ NASA — Natural and Induced Environments, Volume 2 https://www.nasa.gov/reference/6-0-natural-and-induced-environments-vol-2/ NASA — Carbon Dioxide Technical Brief https://www.nasa.gov/wp-content/uploads/2023/12/ochmo-tb-004-carbon-dioxide.pdf NASA NTRS — Management of the Post-Shuttle EMU Water Circuits https://ntrs.nasa.gov/citations/20120003778 NASA NTRS — Analytical Review of Exploration Extravehicular Mobility Unit Heat Rejection Performance https://ntrs.nasa.gov/citations/20240004206 The exploration-suit paper is related research, distinct from the ISS EMU sublimator described here. NASA — EVA and Environmental Physiology https://www.nasa.gov/directorates/esdmd/hhp/space-suits-and-exploration-operations/ NASA-STD-3001, Volume 2 — Spacesuits https://www.nasa.gov/reference/11-0-spacesuits-vol-2/ NASA ISS Reference Guide https://www.nasa.gov/wp-content/uploads/2022/06/508318main_iss_ref_guide_nov2010.pdf Find us on: YouTube: https://youtube.com/watch?v=MjmArrJLY6I Facebook: https://www.facebook.com/profile.php?id=61594406836899 Instagram: https://www.instagram.com/greenbigspacealien15/ X: https://x.com/GreenSpacealie TikTok: https://www.tiktok.com/@greenbigspace15 Reddit: https://www.reddit.com/r/GreenSpacealien15/ Dailymotion: https://www.dailymotion.com/user/green.hbw590 Pinterest: https://www.pinterest.com/greenbigspacealien15/ Rumble: https://rumble.com/user/greenspacealien15 Threads: https://www.threads.com/@greenbigspacealien15 Bluesky: https://bsky.app/profile/greenspacealien15.bsky.social

  3. 2d ago

    Why Do Rockets Work in a Vacuum?

    How can a rocket accelerate where there is almost no air? Follow one liquid-propellant engine as it sends exhaust backward through a nozzle, then compare a powered burn with the coast that follows. The example uses fuel and liquid oxygen carried by the rocket; other rocket engines can use different propellants. Sections 00:00 What a Rocket Pushes Against 01:54 Nozzle, Motion, and Coast Music: original score created for this GreenSpacealien video, with no third-party recordings or samples. Sources and further reading NASA Glenn — Rocket Thrust https://www1.grc.nasa.gov/beginners-guide-to-aeronautics/rocket-thrust/ NASA Glenn — Liquid Rocket Engine https://www1.grc.nasa.gov/beginners-guide-to-aeronautics/liquid-rocket-engine/ NASA Glenn — Propulsion System https://www1.grc.nasa.gov/beginners-guide-to-aeronautics/propulsion-system/ NASA Glenn — Rocket Control https://www1.grc.nasa.gov/beginners-guide-to-aeronautics/rocket-control/ NASA — Basics of Space Flight: Gravity and Mechanics https://science.nasa.gov/learn/basics-of-space-flight/chapter3-2/ NASA — Basics of Space Flight: Onboard Systems https://science.nasa.gov/learn/basics-of-space-flight/chapter11-2/ Find us on: YouTube: https://youtube.com/watch?v=FYRiS4js0Bg Facebook: https://www.facebook.com/profile.php?id=61594406836899 Instagram: https://www.instagram.com/greenbigspacealien15/ X: https://x.com/GreenSpacealie TikTok: https://www.tiktok.com/@greenbigspace15 Reddit: https://www.reddit.com/r/GreenSpacealien15/ Dailymotion: https://www.dailymotion.com/user/green.hbw590 Pinterest: https://www.pinterest.com/greenbigspacealien15/ Rumble: https://rumble.com/user/greenspacealien15 Threads: https://www.threads.com/@greenbigspacealien15 Bluesky: https://bsky.app/profile/greenspacealien15.bsky.social

  4. 2d ago

    Reading Bennu: The Journey of an Asteroid Sample

    NASA’s OSIRIS-REx mission returned 121.6 grams of material from asteroid Bennu. This episode follows what scientists can learn from a returned sample: how it was collected and curated, what its minerals and isotopes record, and how comparisons with Ryugu, Itokawa, and meteorites help test ideas about the early Solar System. Each result applies to particular samples and measurements; no whole-asteroid census is claimed. Proposed parent-body settings are reconstructions from evidence, not a direct map of an ancient orbit. Organic chemistry informs prebiotic possibilities; the data do not establish life. Chapters:00:00:00 One Grain, Several Clocks00:02:59 What a Fall to Earth Changes00:15:21 What the Remote View Could See00:30:18 A Local Collection, Not a Whole-Asteroid Census00:44:33 The Chain That Protects a Measurement00:57:17 Ingredients With Different Addresses01:18:18 Water Rewrites the Record01:32:20 Ryugu and the Meteorites Beside Bennu01:42:23 What Itokawa Adds to a Returned Sample01:53:41 Chemistry Before Biology02:04:36 Where Could the Parent Bodies Have Formed? Sources and further reading:NASA Science, “NASA Announces OSIRIS-REx Bulk Sample Mass” (15 Feb 2024). https://science.nasa.gov/blogs/osiris-rex/2024/02/15/nasa-announces-osiris-rex-bulk-sample-mass/Lunning et al., “OSIRIS-REx Curation: The First Year with Bennu Samples on Earth,” NASA Technical Reports Server 20240010710. https://ntrs.nasa.gov/citations/20240010710JAXA, Ryugu sample curation. https://curation.isas.jaxa.jp/en/sample-curation/ryugu/Nakamura et al. (2023), Science. https://doi.org/10.1126/science.abn8671Yabuta et al. (2023), Nature Communications. https://doi.org/10.1038/s41467-023-36904-3Koga et al. (2026), Nature Astronomy. https://doi.org/10.1038/s41550-026-02791-zJAXA, Itokawa sample curation. https://curation.isas.jaxa.jp/en/sample-curation/itokawa/Nakamura et al. (2011), Science. https://doi.org/10.1126/science.1207758Yurimoto et al. (2011), Science. https://doi.org/10.1126/science.1207776Glavin et al. (2025), Proceedings of the National Academy of Sciences, e2512461122. https://doi.org/10.1073/pnas.2512461122Barnes et al. (2025), “The variety and origin of materials accreted by Bennu’s parent asteroid,” Nature Astronomy 9, 1785–1802. https://doi.org/10.1038/s41550-025-02631-6Schönbächler et al. (2026), Science Advances 12(39), eaei9107. https://doi.org/10.1126/sciadv.aei9107Kawasaki et al. (2026), “Refractory inclusions in Bennu samples indicative of outer Solar System accretion,” Nature Communications 17, 8797. https://doi.org/10.1038/s41467-026-73868-6 Visual data credit: Schönbächler et al. (2026), DOI 10.1126/sciadv.aei9107, CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Table 1 values redrawn from the article’s reported data; no article figures or supplement graphics used. Find us on:YouTube: https://www.youtube.com/@GreenSpacealien15Facebook: https://www.facebook.com/profile.php?id=61594406836899Instagram: https://www.instagram.com/greenbigspacealien15/X: https://x.com/GreenSpacealieTikTok: https://www.tiktok.com/@greenbigspace15Reddit: https://www.reddit.com/r/GreenSpacealien15/Dailymotion: https://www.dailymotion.com/user/green.hbw590Pinterest: https://www.pinterest.com/greenbigspacealien15/Rumble: https://rumble.com/user/greenspacealien15Threads: https://www.threads.com/@greenbigspacealien15Bluesky: https://bsky.app/profile/greenspacealien15.bsky.social

    Reading Bennu: The Journey of an Asteroid Sample

  5. 5d ago

    Dark Matter: Following the Evidence

    A galaxy’s outer regions can keep moving faster than a calculation based on its visible stars and gas predicts. That difference begins a careful journey through the evidence for unseen gravitating matter—and through the places where the explanation remains open. We follow how spectral shifts become rotation curves, how many faint shape distortions become a statistical lensing profile, and why the Bullet Cluster’s displaced hot gas matters when compared with a lensing reconstruction. The oldest-light matter fit, primordial deuterium and fast-radio-burst dispersion add different constraints, each with its own model assumptions. Compact-object surveys and laboratory searches test particular possibilities; they do not name the cosmic component. A galaxy-scale alternative such as MOND also deserves a fair comparison, especially beyond rotation curves. The story’s conclusion is measured: several observational routes fit a framework with gravitating mass beyond luminous ordinary matter, while the particle identity remains unknown. A colored lensing map is an inference from distorted light, not a photograph of dark matter. Cosmological densities depend on the stated model and combined data. Chapters:00:00:00 The galaxy that keeps moving00:06:10 Reading a galaxy in its light00:17:34 What the light can weigh00:29:56 A relation across galaxies00:43:13 Gravity bends background light00:54:07 When clusters collide01:05:40 The inventory in the oldest light01:18:54 What “dark” and “cold” mean01:43:59 Searching for a name01:55:53 One event, and what it does not say02:02:30 What else could gravity be doing?02:11:10 The case we can close Sources: Rubin et al. (1980): https://articles.adsabs.harvard.edu/pdf/1980ApJ...238..471RSPARC (2016): https://arxiv.org/abs/1606.09251RAR data: https://astroweb.cwru.edu/SPARC/DDO 154 data: https://zenodo.org/records/16284118RAR (2016): https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.117.201101CFHTLS (2007): https://arxiv.org/abs/0707.1698Clowe et al. (2006): https://arxiv.org/abs/astro-ph/0611496Planck VI (2018): https://arxiv.org/abs/1807.06209DESI DR2 (2025): https://arxiv.org/abs/2503.14738Cooke et al., deuterium (2018): https://arxiv.org/abs/1710.11129Kislitsyn et al., deuterium (2024): https://arxiv.org/abs/2401.12797LUNA deuterium burning (2020): https://www.nature.com/articles/s41586-020-2878-4Connor et al., FRB baryon census (2025): https://arxiv.org/abs/2409.16952Liu et al., joint FRB/SN/BAO/Planck (2026): https://doi.org/10.1103/mdvc-wq7tOGLE LMC compact-lens search (2024): https://arxiv.org/abs/2403.02398OGLE SMC compact-lens search (2025): https://doi.org/10.3847/1538-4365/adf842Milgrom, original MOND proposal (1983): https://adsabs.harvard.edu/pdf/1983ApJ...270..365MZhang et al., Bullet Cluster MOND/IGIMF (2026): https://journals.aps.org/prd/abstract/10.1103/6zrp-q7c4LZ low-mass WIMP search (2025, later version): https://arxiv.org/abs/2512.08065XENONnT WIMP search (2025): https://arxiv.org/abs/2502.18005ADMX axion search (2025): https://arxiv.org/abs/2504.07279LZ nuclear-recoil analysis (2026 preprint): https://arxiv.org/abs/2609.02823 Find us on:YouTube: https://www.youtube.com/@GreenSpacealien15Facebook: https://www.facebook.com/profile.php?id=61594406836899Instagram: https://www.instagram.com/greenbigspacealien15/X: https://x.com/GreenSpacealieTikTok: https://www.tiktok.com/@greenbigspace15Reddit: https://www.reddit.com/r/GreenSpacealien15/Dailymotion: https://www.dailymotion.com/user/green.hbw590Pinterest: https://www.pinterest.com/greenbigspacealien15/Rumble: https://rumble.com/user/greenspacealien15Threads: https://www.threads.com/@greenbigspacealien15Bluesky: https://bsky.app/profile/greenspacealien15.bsky.social

    Dark Matter: Following the Evidence

  6. Oct 4

    How Far Can We Actually See? | Calm Space to Fall Asleep To

    What can we see when light has crossed an expanding universe, and what does “distance” mean in that setting? This quiet journey separates light-travel time, lookback time, present distance, and cosmological horizons. In the selected flat Planck-baseline ΛCDM model, the particle-horizon radius today is about 46 billion light-years. This is a model estimate of causal reach, not a directly seen object at that distance or a physical edge. Other distance definitions give different answers. Selected sources and credits - Planck Collaboration, 2018 cosmological parameters (https://doi.org/10.1051/0004-6361/201833910) and 68% parameter tables (https://wiki.cosmos.esa.int/planck-legacy-archive/images/d/d4/Result_table_2018_68pc.pdf). - Davis & Lineweaver (2004), cosmological horizons (https://doi.org/10.1071/AS03040); Hogg (1999), distance measures in cosmology (https://arxiv.org/abs/astro-ph/9905116). - NASA, what a light-year is (https://science.nasa.gov/exoplanets/what-is-a-light-year/); ESA, Planck and the cosmic microwave background (https://www.esa.int/Science_Exploration/Space_Science/Planck/Planck_and_the_cosmic_microwave_background). - Selected Webb image credits: NASA, ESA, CSA, STScI, Webb’s First Deep Field (SMACS 0723) (https://science.nasa.gov/asset/webb/webbs-first-deep-field-nircam-image/); NASA, ESA, CSA, STScI, Rohan Naidu (MIT), image processing Joseph DePasquale (STScI), COSMOS Field MoM-z14 Galaxy (https://science.nasa.gov/asset/webb/cosmos-field-mom-z14-galaxy-nircam-image/). - DESI Collaboration, 2026 Lyman-alpha results (https://www.desi.lbl.gov/2026/07/30/new-desi-dr2-lyman-alpha-results-shed-light-on-dark-energy/). This is a specific data/model comparison, not a final verdict on dark energy. 0:00 The View Arrives Late 5:42 How Far Away Is “Now”? 14:45 The First Ruler 26:44 Candles Across the Galaxy 39:31 When the Grid Itself Changes 51:41 Reading a Faint Patch of Sky 1:03:06 Galaxies From the Early Universe 1:13:40 Before the Sky Turned Transparent 1:22:14 The Distance to the Last Light 1:32:10 The Particle Horizon 1:44:15 The Hubble Sphere Is Not the Edge 1:50:02 What We Cannot Map From Here 1:59:00 A Horizon That Changes With Time 2:14:24 One Sky, Several Distances

  7. Oct 3

    The Moon Changed Earth—and Earth Changed the Moon | Calm Space to Fall Asleep To

    Earth’s spin, lunar orbit, and oceans have changed together over deep time. This calm documentary traces evidence from competing Moon-formation accounts through tides and incomplete geological records to today’s laser-ranging measurements. The current average recession rate is about 3.8 centimetres per year; it has not been constant through Earth’s history. Ancient sediment preserves local, incomplete records. The Moon affects Earth’s tides and axial dynamics, but the evidence does not show that it was required for life. Selected sources and credits - NASA, Moon facts (https://science.nasa.gov/moon/facts/) and lunar laser-ranging data (https://data.nasa.gov/dataset/cddis-llr-data); Young et al. (2016) (https://doi.org/10.1126/science.aad0525). - Visual source credit: James St. John, Tidalites (Elatina Formation, Neoproterozoic; Pichi Richi Pass stream cut, South Flinders Ranges, South Australia) 2 (https://commons.wikimedia.org/wiki/File:Tidalites_(Elatina_Formation,_Neoproterozoic;_Pichi_Richi_Pass_stream_cut,_South_Flinders_Ranges,_South_Australia)_2_(30441202460).jpg), CC BY 2.0. The photo is cropped and laid out beside a separately authored schematic. - Williams (2000) (https://doi.org/10.1029/1999RG900016) on geological constraints; Huang et al. (2024) (https://doi.org/10.1073/pnas.2317051121) on changing rotational deceleration. - Li & Batygin (2014) (https://doi.org/10.1088/0004-637X/790/1/69), Lissauer et al. (2012) (https://doi.org/10.1016/j.icarus.2011.10.013), and Song et al. (2024) (https://doi.org/10.1073/pnas.2412784121). The laboratory study does not show that the Moon was necessary for life. 0:00 A Small Retreat, a Long Memory 4:51 Two Worlds, One Ledger 13:07 Before There Was a Moon 22:25 The Impact Account—and Its Unfinished Parts 32:20 From Hot Debris to a Lunar Crust 41:38 The First Great Exchange 50:57 How the Moon Learned One Face 59:53 The Ocean Is Part of the Engine 1:09:28 A Day Preserved in Stone 1:19:24 Why the Moon's Past Is Not a Straight Line 1:29:06 Continents Rebuild the Tide 1:33:18 Does the Moon Steady Earth's Seasons? 1:43:12 Tides and the Conditions for Life 1:52:58 The Moon Reads Earth Back 2:02:24 The Clock Keeps Changing

  8. Oct 2

    Why Venus’s Sky Outruns Its Planet | Weather Beyond Earth | Calm Space to Fall Asleep To

    Venus offers a striking opening: its cloud tops circle the planet in roughly four to five days while the solid world turns much more slowly. From that contrast, this calm documentary asks how energy, chemistry, rotation, and measurement shape weather on other worlds. The journey compares Venus, Titan, Mars, Jupiter, Saturn, and distant exoplanets. It distinguishes measured motion and instrument readings from inferred maps and model explanations. A reconstructed exoplanet temperature pattern is not a photograph. Selected sources and credits - Venus rotation and cloud tracking: NASA Venus Facts (https://science.nasa.gov/venus/venus-facts/), Peralta et al. (2020) (https://doi.org/10.1038/s41467-020-19385-6), Horinouchi et al. (2021) (https://www.nature.com/articles/s41586-021-03636-7). - Titan’s Cassini record: Turtle et al. (2018) (https://doi.org/10.1029/2018GL078170). Mars’ dust-storm measurements: Guzewich et al. (2018) (https://doi.org/10.1029/2018GL080839). Jupiter’s deep jets: Kaspi et al. (2018) (https://doi.org/10.1038/nature25793). - Exoplanet methods: NASA Webb overview (https://science.nasa.gov/mission/webb/science-overview/science-explainers/how-will-webb-study-exoplanets/). - Visual credit for the cropped ESA/Webb WASP-43 b MIRI phase-curve chart: NASA, ESA, CSA, R. Crawford (STScI), T. Bell (BAERI), J. Barstow (The Open University), M. Roman (University of Leicester). The original graphic was cropped and resized for the curve panel. Source (https://esawebb.org/images/WASP43b-2/) · CC BY 4.0 reuse terms (https://esawebb.org/copyright/). 0:00 The Sky That Outruns Its World 5:44 Weather Without a Familiar Ground 13:14 The Energy That Starts the Motion 24:30 Air That Filters Its Own Sunlight 32:57 Rotation Draws Broad Currents 41:11 Venus: The Fast Sky 52:07 Titan: A Methane Cycle 1:04:01 Mars: Dust Changes the Air 1:14:40 Jupiter: The Weather Below the Clouds 1:22:02 Saturn: The Jets That Draw Polygons 1:31:51 The Seasons Written in Slow Motion 1:42:37 The Day Side and the Night Side 1:51:40 Reading Weather in Starlight 1:59:59 What a Forecast Can and Cannot Say 2:08:31 Returning to Earth as a Comparison

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Slow down and explore the universe with GreenSpacealien - Quiet Cosmos. Calm, chaptered astronomy documentaries journey through stars, black holes, planets and the space systems shaping everyday life. Follow the evidence, learn or unwind with Calm Space to Fall Asleep To. Watch our documentaries, discover original science Shorts and find every social profile: https://www.youtube.com/@GreenSpacealien15 Choose Spotify or your favourite podcast app: https://creators.spotify.com/pod/profile/greenspacealien15/

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