Habitable Worlds . ... Credit Copyright: Planetary Habitability Laboratory ( UPR Arecibo ) Explanation: Is Earth the only known world that can support life? In an effort to find life-habitable worlds outside our Solar System , stars similar to our Sun are being monitored for slight light decreases that indicate eclipsing planets . Many previously-unknown planets are being found, including over 700 worlds recently uncovered by NASA's Kepler satellite. ... NASA Official: Jay Norris. ...