A massive crater on asteroid Psyche may hold the key to whether it’s a lost planet’s core or something more complex. New simulations suggest NASA’s upcoming mission could finally solve the mystery.

A fridge-size space rock spectacularly broke apart over Ohio at 40,000 mph, creating a loud boom and a rare "fireball" that shone in the bright blue daytime sky. The rare sight, which exploded with ...

For decades, astronomers have struggled to differentiate giant planets from brown dwarfs, a class of objects more massive ...