Neptune’s smallest moon may be a chip off another moon

CHIP OFF THE OLD BLOCK A massive collision that left Neptune’s second largest moon, Proteus (as seen in the background of this illustration) with a huge crater may have spawned its smallest moon, Hippocamp (foreground).

Neptune’s smallest moon may be a chunk of a neighboring moon that was knocked off by a comet.One of seven moons that orbit closer to Neptune than the planet’s largest moon, Triton, the newly dubbed Hippocamp is just roughly 34 kilometers across, researchers report in the Feb. 21 Nature. The