For centuries, the night sky has seemed frozen and unchanging, yet time-lapse observations reveal that the universe is in constant motion. From the expanding gas clouds of the Crab Nebula to the ...

A new time lapse from the International Space Station captures a meteor streaking into the atmosphere and vaporizing above the planet, turning a fleeting flash into a slow, cinematic sequence. From ...

For a star, its initial mass is everything. It determines how quickly it burns through its hydrogen and how it will evolve once it starts fusing heavier elements. It’s so well understood that ...