Being hip to PR is certainly part of the job description for NASA astronauts, but some are especially social media-savvy. Take fresh ISS resident Gregory "Reid" Wiseman: the man knows he's in a privileged position to take photos and videos, and holy crap has he shared. Via Twitter, Reid has provided nearly 500 stunning images of Earth, the ISS, his fellow astronauts and even a prosaic toilet repair -- sorry, space toilet repair.
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.
useless things