The path to Mars goes through the moon — or the region of space near the moon, anyway. NASA aims to put boots on Mars in the 2030s after first gathering human-spaceflight experience and expertise in low Earth orbit and the "proving ground" of cis-lunar space near the moon.
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.