Photographic plates going back to 1890 are providing new clues as to whether a distant exoplanet has a giant ring system, more than 100 times wider than Saturn's.
The long, thin, white cloud has been seen extending west of a Martian volcano since September 13. It looks as if it could be volcanic, yet it isn't. Here's what's going on.
A research team has documented a volcanic eruption in the western Pacific Ocean that's deeper below the ocean surface than Mount Rainier’s height above sea level.
A planetary nebula isn't related to planets. It's an old star, sloughing off its outer layers. Now astronomers have spied 2 ultra-close stars at a planetary nebula's heart. The pair orbits in only 3 hours!