As astronomers get closer to finding potential signatures of life on faraway planets, a new mathematical description shows how to understand life's spread — and to determine if it's jumping from star to star.
The supermassive black hole is 40 million times as massive as the sun and powers a quasar that existed 700 million years after the Big Bang.
The asteroid zoomed by Earth at a perfectly safe distance of around 1.8 million miles (2.9 kilometers).
Images show surprise changes to the spacecraft as it interacted with the atmosphere.
