They extend around 1000 times the distance between the Earth and the sun.
They flew there on a SpaceX spacecraft.
A study shows other solar systems could have up to seven habitable planets.
The problem wasn't detected in pre-launch testing, and had never come up before.
Scientists say it may solve a long-standing cosmic mystery.
Astronomers released the photo on July 22.
It's not quite a rocket, but it's still pretty cool.
A bombardment of meteors dwarfed that which killed the dinosaurs, scientists say.
The 'campfires' are believed to be tiny explosions, called nanoflares.
