Rocky Exoplanet Discovered!

http://www.time.com/time/health/article/0,8599,2041683,00.html
a huge step closer. Called Kepler-10b, it's just 40% larger than Earth — the smallest planet yet found outside our solar system. Not only that: unlike the vast majority of the 500-odd exoplanets found to date, and unlike Jupiter and Neptune, Kepler-10b isn't just a huge ball of gas or ice. Like Earth, it's made of rock. "This is a historic discovery," said Geoff Marcy of the University of California, Berkeley,