After determining that the ocean beneath the icy surface of Saturn’s moon Enceladus has roughly the same pH as Windex or soapy water -- an indication that the water has been in contact with rock, creating potentially life-friendly chemistry -- scientists are moving on to the trickier hunt for evidence of hydrothermal venting.
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.
