棕矮星系中可能存在宜居行星（英文）

摘要

NASA(美国国家航空航天局)continues to search space for rocky planets orbiting nearby stars with the Kepler Space Telescope(开普勒太空望远镜).Two such planets found by Kepler orbit the star TRAPPIST-1,a brown-dwarf(棕矮星)40 light-years from Earth,lie just outside the ideal"habitable zone"where water can exist in liquid form on the planet’s surface.This planetary system is more similar to Jupiter(木星)and its moons.