Astronomers Found a Moon That Breaks the Rules

Added: 2026-05-17

[00:00:01]Astronomers studying a distant star found something [music] they didn't expect. A giant planet called Kepler-1625b and a moon candidate that shouldn't be orbiting it. This moon is almost the size of Neptune, a moon bigger than most planets. And that's the first problem.

[00:00:21]Moons aren't supposed to be this massive. Nothing in our solar system even comes close. But the second problem is stranger. Its orbit doesn't match what the planet's gravity should allow.

[00:00:33]It drifts, it wobbles, it pulls the planet off course in ways scientists can't fully explain. Some think it's a captured world, a rogue planet that Kepler-1625b stole billions of years ago.

[00:00:47]>> [music] >> Others believe it formed after a colossal collision, the kind that tears entire worlds apart. And a few whisper that we might be seeing something [music] new, a type of moon that shouldn't exist at all. Because if this moon is real, it rewrites everything we know about how planets and moons are born. [music]