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.These NASA (English only) NASA continues to search space for rocky planets orbiting nearby stars with the Kepler Space Telescope. Two such planets found by Kepler orbit the star TRAPPIST-1, a brown-dwarf Dwarf star) 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 and its moons.These