Life in space has been a subject of debate for a long time now. Now molecular oxygen has been found on a comet and scientists have come up with different theories to explain this startling discovery.
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.