Using the relatively new technique of gravitational microlensing, astronomers discover their “most Earth-like planet yet”, orbiting a star in Sagittarius 20,000 light-years away. While this planet — currently named OGLE-2005-BLG-390Lb — is likely too cold for habitation, “‘we may predict with reasonable probability that microlensing will discover planets with masses like that of Earth at a similar distance from their stars and with comparable surface temperature,’ said study co-author Bohdan Paczynski from Princeton University.“