It's hard to get a good night's sleep in orbit. Astronauts on the International Space Station see a sunrise every 90 minutes or so, which leads to some seriously messed-up internal clocks. Sleeping pills help a bit, but now scientists think they can game circadian rhythms more naturally—and effectively—with new light bulbs.
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.
