Temperatures on a nearby "super Earth" exoplanet varied dramatically recently, suggesting that large and very active volcanoes may exist on the alien world's surface, a new study reports
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.
