Europa, Jupiter’s frigid moon, may not look very welcoming from the outside. But it’s what’s inside that counts, and scientists are pretty sure there’s a liquid ocean beneath that icy shell. Europa could be prime real estate for simple alien lifeforms, and sometime in the 2020s, NASA's hoping to send a spacecraft there.
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.
