Stellar Realm

@watchstellarrealm.bsky.social

How the universe works. Told properly. Documentaries on stars, supernovae and black holes, built on real NASA, ESA and ESO imagery, with every fact checked against published science. Narration and music are AI-generated; the science is not.

10 vidéos publiées

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The Sun shouldn't be able to shine. Its core is 15 million degrees, and that is still too cold for two protons to touch. They fuse anyway, by quantum tunnelling, and the light takes 100,000 years to walk out. AI narration and music.

0 vue 21/10/2026

1995: Hubble's director pointed the telescope at an empty-looking patch of sky for 10 days. It held about 3,000 galaxies. In 2004: 10,000 in a patch a tenth the width of the Moon. Image credits in the YouTube description. AI narration and music.

0 vue 20/10/2026

About 19 in every 20 galaxies we can see are already out of reach. The expansion is speeding up, so a light-speed message sent today would never arrive. We only see their old light. Images: diagrams: Stellar Realm. AI narration and music.

0 vue 19/10/2026

The universe is 13.8 billion years old, but we can see more than 90 billion light-years across it. Nothing broke the speed of light: space kept stretching while the light was on its way. Image credits in the YouTube description. AI narration and music.

0 vue 18/10/2026

1912: Henrietta Swan Leavitt found that the brighter a pulsing Cepheid star truly is, the slower it pulses. Time the pulse, get the true brightness, get the distance. That rule measured the universe. Image credits in the YouTube description. AI narration and music.

0 vue 17/10/2026

5 October 1923: Edwin Hubble crossed out an 'N' on a glass plate of Andromeda and wrote 'VAR!'. A pulsing star. Andromeda was a whole other galaxy, and the universe got bigger overnight. Image credits in the YouTube description. AI narration and music.

0 vue 16/10/2026

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1995: Hubble's director pointed the telescope at an empty-looking patch of sky for 10 days. It held about 3,000 galaxies. In 2004: 10,000 in a patch a tenth the width of the Moon. Image credits in the YouTube description. AI narration and music.

0 vue 20/10/2026

The Sun shouldn't be able to shine. Its core is 15 million degrees, and that is still too cold for two protons to touch. They fuse anyway, by quantum tunnelling, and the light takes 100,000 years to walk out. AI narration and music.

0 vue 21/10/2026

About 19 in every 20 galaxies we can see are already out of reach. The expansion is speeding up, so a light-speed message sent today would never arrive. We only see their old light. Images: diagrams: Stellar Realm. AI narration and music.

0 vue 19/10/2026

The universe is 13.8 billion years old, but we can see more than 90 billion light-years across it. Nothing broke the speed of light: space kept stretching while the light was on its way. Image credits in the YouTube description. AI narration and music.

0 vue 18/10/2026

1912: Henrietta Swan Leavitt found that the brighter a pulsing Cepheid star truly is, the slower it pulses. Time the pulse, get the true brightness, get the distance. That rule measured the universe. Image credits in the YouTube description. AI narration and music.

0 vue 17/10/2026

5 October 1923: Edwin Hubble crossed out an 'N' on a glass plate of Andromeda and wrote 'VAR!'. A pulsing star. Andromeda was a whole other galaxy, and the universe got bigger overnight. Image credits in the YouTube description. AI narration and music.

0 vue 16/10/2026

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You are made of star-stuff. The iron in your blood was made by stars. Not a metaphor. Images: ESA/Hubble, NASA, ESO, ALMA (CC BY 4.0), Pexels. AI narration and music.

0 vue 10/10/2026

On 18 November 2026, Voyager 1 becomes the first human-made object one light-day from Earth. 49 years of flying. A radio message will take a full day to reach it. Image credits in the YouTube description. AI narration and music.

0 vue 13/10/2026

If the Sun vanished right now, you'd have 8 more minutes of sunshine. And Earth would keep orbiting nothing for those same 8 minutes: gravity travels at the speed of light too. Image credits in the YouTube description. AI narration and music.

0 vue 14/10/2026

Voyager 1: 49 years to get 1 light-day from Earth. Proxima Centauri, the nearest star: 1,551 light-days. At Voyager's speed, about 75,000 years. Images: NASA (KSC-77P-232) (Public domain); ESA/Hubble & NASA (CC BY 4.0); diagrams: Stellar Realm. AI narration and music.

0 vue 15/10/2026

5 October 1923: Edwin Hubble crossed out an 'N' on a glass plate of Andromeda and wrote 'VAR!'. A pulsing star. Andromeda was a whole other galaxy, and the universe got bigger overnight. Image credits in the YouTube description. AI narration and music.

0 vue 16/10/2026

1912: Henrietta Swan Leavitt found that the brighter a pulsing Cepheid star truly is, the slower it pulses. Time the pulse, get the true brightness, get the distance. That rule measured the universe. Image credits in the YouTube description. AI narration and music.

0 vue 17/10/2026

Stellar Realm

Dernières vidéos

The Sun shouldn't be able to shine. Its core is 15 million degrees, and that is still too cold for two protons to touch. They fuse anyway, by quantum tunnelling, and the light takes 100,000 years to walk out. AI narration and music.

1995: Hubble's director pointed the telescope at an empty-looking patch of sky for 10 days. It held about 3,000 galaxies. In 2004: 10,000 in a patch a tenth the width of the Moon. Image credits in the YouTube description. AI narration and music.

About 19 in every 20 galaxies we can see are already out of reach. The expansion is speeding up, so a light-speed message sent today would never arrive. We only see their old light. Images: diagrams: Stellar Realm. AI narration and music.

The universe is 13.8 billion years old, but we can see more than 90 billion light-years across it. Nothing broke the speed of light: space kept stretching while the light was on its way. Image credits in the YouTube description. AI narration and music.

1912: Henrietta Swan Leavitt found that the brighter a pulsing Cepheid star truly is, the slower it pulses. Time the pulse, get the true brightness, get the distance. That rule measured the universe. Image credits in the YouTube description. AI narration and music.

5 October 1923: Edwin Hubble crossed out an 'N' on a glass plate of Andromeda and wrote 'VAR!'. A pulsing star. Andromeda was a whole other galaxy, and the universe got bigger overnight. Image credits in the YouTube description. AI narration and music.

Vidéos populaires

1995: Hubble's director pointed the telescope at an empty-looking patch of sky for 10 days. It held about 3,000 galaxies. In 2004: 10,000 in a patch a tenth the width of the Moon. Image credits in the YouTube description. AI narration and music.

The Sun shouldn't be able to shine. Its core is 15 million degrees, and that is still too cold for two protons to touch. They fuse anyway, by quantum tunnelling, and the light takes 100,000 years to walk out. AI narration and music.

About 19 in every 20 galaxies we can see are already out of reach. The expansion is speeding up, so a light-speed message sent today would never arrive. We only see their old light. Images: diagrams: Stellar Realm. AI narration and music.

The universe is 13.8 billion years old, but we can see more than 90 billion light-years across it. Nothing broke the speed of light: space kept stretching while the light was on its way. Image credits in the YouTube description. AI narration and music.

1912: Henrietta Swan Leavitt found that the brighter a pulsing Cepheid star truly is, the slower it pulses. Time the pulse, get the true brightness, get the distance. That rule measured the universe. Image credits in the YouTube description. AI narration and music.

5 October 1923: Edwin Hubble crossed out an 'N' on a glass plate of Andromeda and wrote 'VAR!'. A pulsing star. Andromeda was a whole other galaxy, and the universe got bigger overnight. Image credits in the YouTube description. AI narration and music.

Premières vidéos

You are made of star-stuff. The iron in your blood was made by stars. Not a metaphor. Images: ESA/Hubble, NASA, ESO, ALMA (CC BY 4.0), Pexels. AI narration and music.

On 18 November 2026, Voyager 1 becomes the first human-made object one light-day from Earth. 49 years of flying. A radio message will take a full day to reach it. Image credits in the YouTube description. AI narration and music.

If the Sun vanished right now, you'd have 8 more minutes of sunshine. And Earth would keep orbiting nothing for those same 8 minutes: gravity travels at the speed of light too. Image credits in the YouTube description. AI narration and music.

Voyager 1: 49 years to get 1 light-day from Earth. Proxima Centauri, the nearest star: 1,551 light-days. At Voyager's speed, about 75,000 years. Images: NASA (KSC-77P-232) (Public domain); ESA/Hubble & NASA (CC BY 4.0); diagrams: Stellar Realm. AI narration and music.

5 October 1923: Edwin Hubble crossed out an 'N' on a glass plate of Andromeda and wrote 'VAR!'. A pulsing star. Andromeda was a whole other galaxy, and the universe got bigger overnight. Image credits in the YouTube description. AI narration and music.

1912: Henrietta Swan Leavitt found that the brighter a pulsing Cepheid star truly is, the slower it pulses. Time the pulse, get the true brightness, get the distance. That rule measured the universe. Image credits in the YouTube description. AI narration and music.

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