Episodes

  • Should Pluto Be a Planet Again?
    Jul 1 2026

    Will Pluto ever be a planet again?


    This supercut explores our favourite dwarf planet: Pluto. We’ll discover why its planetary status really got revoked, take a closer look at what’s hiding under the surface, and reveal the surprising discoveries on its largest moon, Charon. To those returning and new to the channel: This video is a supercut of some of Astrum’s best Pluto videos, plus new and updated content. We’ve edited this into a new seamless video, remastered in 4K resolution.


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    39 mins
  • This Gravity Explanation Will Make You Question the Entire Universe
    Jun 29 2026

    This compilation brings together Astrum’s best content on one of the universe’s biggest mysteries: gravity. We’ll dive into some mind-bending concepts: how gravity is actually just mass warping the fabric of spacetime, how gravitational waves ripple across the universe, and investigate the biggest gravitational anomalies we’ve ever seen.▀▀▀▀▀▀


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    56 mins
  • The Giant Creatures Lurking Deep in the Ocean | Astrum Earth
    Jun 24 2026

    Earth’s deepest oceans are full of real-life monsters: colossal squids, crabs the size of cars, and sharks with catapulting jaws. In this video, we’re exploring the giants of the deep sea. Find out what scientists have discovered, and why the most extreme depths breed the ocean's biggest creatures.▀▀▀▀▀▀

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    41 mins
  • Sagittarius A* Might Not Be a Black Hole
    Jun 18 2026

    A new theory is challenging everything we know about Sagittarius A*, the supermassive object at the heart of our galaxy. For decades, physicists have been certain it’s a black hole. They have observed its effects and even built a planet-sized telescope just to image it. But now, a mind-bending theory is turning our understanding upside down. What if Sagittarius A* isn’t a black hole at all, but something far stranger?▀▀▀▀▀▀

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    26 mins
  • These Orbits Are Not Normal
    Jun 15 2026

    This compilation explores the weirdest orbits that could ever exist. We’ll explore backwards-orbiting Moons, strange orbits at the outer edge of our Solar System, and theorise how planets could exist with multiple suns. Join us to find out how these weird orbits actually work, and why some don’t behave how you’d expect. ▀▀▀▀▀▀

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    49 mins
  • 3I/ATLAS Just Did the Strangest Thing Yet
    Jun 11 2026

    3I/ATLAS is leaving the Solar System. Having flown past Jupiter and now rapidly receding into deep space, the interstellar object has scientists scrambling to make final observations before it is out of reach forever. In our fourth and final video about 3I/ATLAS, we're digging into the final images we might ever see of it, the latest discoveries from its loop around our Sun, and the mysterious explosion that could change everything we know.

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    26 mins
  • A Super El Niño Is Coming in 2026 | Astrum Earth
    Jun 9 2026

    El Niño is coming, and it’s predicted to be stronger than ever.


    This year, scientists predict a “Super El Niño” - the most powerful ever recorded. And the data says it could emerge by August. What would a super El Niño mean for us? Should we be worried?▀▀▀▀▀▀

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    22 mins
  • How Big Is the Biggest Star in the Universe?
    Jun 8 2026

    This compilation features some of the weirdest stars in the universe. We’ll investigate Betelgeuse’s impending implosion, why Polaris defies our measurements, and reveal the largest stellar monsters ever discovered. What makes these stars so uniquely strange?▀▀▀▀▀▀

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    1 hr and 4 mins