Most planets are rocky, gassy, or even icy, but some may be almost pure metal. Planets like PSR J1719-1438 b…
Despite being farther from the Sun than Mercury, Venus is hotter—with surface temperatures of 475°C (900°F). Why? A runaway greenhouse…
Astronomers have found supermassive black holes that formed less than a billion years after the Big Bang—before most galaxies even…
Saturn’s north pole has a massive, perfectly shaped hexagon storm—big enough to fit four Earths inside. First spotted by the…
Because the Moon has no atmosphere, there’s no wind, rain, or erosion to wipe away marks on its surface. The…
Some dying stars release winds so powerful that they make hurricanes look like a breeze. The pulsar PSR J1748-2446ad spins…
55 Cancri e is a super-Earth twice the size of our planet, but it’s not your typical rocky world. Because…
Right now, the Andromeda Galaxy is speeding toward us at 110 km/s (68 miles per second). In about 4.5 billion…
The star V838 Monocerotis shocked astronomers in 2002 when it suddenly expanded and started pulsing with light. It wasn’t a…