Astronomers have detected five new planets, eight planet candidates, and confirmed three previously reported planets, around nine nearby M-dwarf (red dwarf) stars. Among the new planets, Gliese 180d and Gliese 229Ac are super-Earths located in the conservative habitable zones of their host stars; Gliese 433c is a cold super-Neptune candidate belonging to an unexplored population of Neptune-like planets. An artist’s concept of the Gliese 180 planetary...