A City-Size Moon Was Hiding Around Neptune
Even to the most powerful telescopes, little Hippocamp appears only as a fuzzy dot in photos.
The planets may get top billing in the solar system, but they are far outnumbered by the moons. There are hundreds, and they come in all kinds of varieties, like a cosmic tray of assorted chocolates. Our is a barren, rocky world coated with craters. Enceladus, of Saturn, and Europa, of Jupiter, are , shrouded in a thick layer of ice with a liquid-ocean center. Io, another moon of Jupiter, is , its surface constantly redrawn
