Is time something that flows — or just an illusion? Exploring space-time as either a fixed “block universe” or a dynamic fabric reveals deeper mysteries about existence, change, and the very nature of ...

Astronomers detected in unprecedented detail a collision between two black holes. Their observations confirm predictions made by Albert Einstein and Stephen Hawking.

Two black holes merged together 2.4 billion light years away from Earth, and scientists have just figured out how fast the newborn ricocheted, and in which direction.