Using a planet-hunting technique called gravitational microlensing, astronomers have detected an Earth-mass planet orbiting an ultracool dwarf 12,750 light-years away. This artist’s concept shows the Earth-mass exoplanet OGLE-2016-BLG-1195Lb. Image credit: NASA / JPL-Caltech. By combining data from space- and ground-based telescopes, the astronomers determined that the newfound world is about 1.4 times the Earth’s mass. Called OGLE-2016-BLG-1195Lb,...