One day we could send spacecrafts to Mars in just three days by using a system known as "photonic propulsion", Nasa scientist Philip Lubin has said. In a video for Nasa 360, he explains how we could use particles of light to push objects through space.
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.
