World Neptune’s new moon Hippocamp is so tiny that it wasn’t detected in 1989 during flyby, scientists report February 20, 2019February 20, 2019Doyle Rice, USA TODAYComments Off on Neptune’s new moon Hippocamp is so tiny that it wasn’t detected in 1989 during flyby, scientists report A new moon was found near Neptune, joining the other 13 we knew about. It's so small that it wasn't detected during the Voyager 2 flyby in 1989.