Gracie Diamond Member Feb 13, 2013 69,390 30,784 2,330 Lost Feb 4, 2016 Thread starter #2,185 NASA Kepler-186f ~ The first known Earth-size planet.
Gracie Diamond Member Feb 13, 2013 69,390 30,784 2,330 Lost Feb 4, 2016 Thread starter #2,197 Saturn rings seen from one of its satellites