The universe is expanding, and that expansion is accelerating, but exactly why and how that’s happening remains unknown. One hypothesis suggests that this expansion is driven by mysterious, black hole ...

Scientists know that the universe is expanding, almost certainly due to the effects of a mysterious force called dark energy — but things tend to break down when we get any more specific than that.

Hand holding a purple geode in a green garden - FotoHelin/Shutterstock This guide highlights accessible, legal locations where enthusiasts can safely hunt for geodes and geode-like formations and take ...