An astronomer has discovered Neptune’s smallest known moon, a mini-world that eluded detection until it was found almost by accident in years-old imagery from the Hubble Space Telescope.
Neptune’s 14th moon, currently known only as S/2004 N 1, is thought to measure no more than 12 miles (20 kilometers) across. It orbits about 65,400 miles (105,250 kilometers) from the ice giant, between the larger Neptunian moons Larissa and Proteus.
Image: This composite Hubble Space Telescope picture shows the location of a newly discovered moon, designated S/2004 N 1, orbiting the giant planet Neptune, nearly 3 billion miles from Earth. (Mark Showalter / SETI Inst. / NASA / ESA)