Two amateur astronomers have captured the moment an asteroid crashed into Jupiter.
It's a huge rock, crashing into a giant planet at tens of thousands of miles an hour.
We don't know exactly how big it is or how fast it was travelling, because you can't work out one without knowing the other.
Phil Plait, Slate's astronomy blogger, estimates that it was in the "tens of metres" range.
Jupiter's gravity is so powerful that objects tend to collide with it around five times faster than they do with Earth. Because of the way the physics works, that means they release 25 times as much energy in the collision – they're 25 times brighter.
So relatively small objects can make flashes that are visible even 665 million kilometres (413 million miles) away.
Asteroids and comets crash into Jupiter fairly often, because it's so big it sweeps up everything that comes near its orbit. The most famous was the Shoemaker-Levy comet in 1994.
