Gamma-ray bursts — explosions lasting no more than a few minutes but that release more energy than the sun will emit in its lifetime — may be coming to Earth via the world's most powerful lasers.
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.