A series of laser flashes recently lit up the night sky above Mauna Kea in Hawaii. Experts say the lasers were emitted by a NASA spacecraft.
Sexsomnia is a disorder that leads people to perform sexual behaviors while they're asleep.
NASA astronomers used the Hubble Space Telescope to measure the mass of a white dwarf, an important step for understanding how stars die.
Twelve newly confirmed moons bring Jupiter's total to 92, surpassing Saturn's 83 moons.