Earth's Nights Are Getting Brighter—But Some Places Are Going Dark!

Scientists looking at Earth from space have discovered something surprising: some parts of the world are getting much brighter at night because of more cities and lights, while other places are actually getting darker because people are turning off unnecessary lights to save energy. It's like someone is turning up the brightness dial in some countries and turning it down in others! This is changing how animals see at night and how people sleep all around the world.