BBC- Astronomers have discovered a unique triple star system which could reveal the true nature of gravity.
They found a pulsar with two white dwarfs all packed in a space smaller than Earth's orbit of the Sun.
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.
