V664 Cas is a binary system consisting of a white dwarf, a stellar corpse, and a red giant star ... This small planetary nebula, like others like it, was formed by gases in the outer layers ...

Planet Earth is the jewel of the solar system—the shimmery blue oceans, the verdant green forests, the wispy whimsical cloud formations. Saturn is the only competitor for mo ...

Decades of constant X-ray emission from the Helix Nebula’s white dwarf suggest debris from a Jupiter-sized planet steadily rains upon the star.