Jupiter's largest moons don't go completely dark when the giant planet blocks their sunlight, astronomers have found.
The discovery could reveal more about Jupiter's mysterious upper atmosphere, which the researchers suspect is responsible for keeping the moons lit when they are not directly illuminated by the sun. This research could also help scientists better understand the atmospheres of alien planets, study team members said.
A black hole is essentially a ludicrous amount of mass concentrated in an incredibly small space. They're called singularities because gravity becomes measurably infinite at a single point. They suck in everything around them like cosmic vacuum cleaners, and past the event horizon of a black hole nothing can escape, not even light.