Kepler Discovers Solar System's Ancient 'Twin'

astroengine writes: Astronomers have found a star system that bears a striking resemblance to our inner solar system. It's a sun-like star that plays host to a system of five small exoplanets — from the size of Mercury to the size of Venus. But there's something very alien about this compact 'solar system'; it formed when the universe was only 20 percent the age it is now, making it the most ancient star system playing host to terrestrial sized worlds discovered to date.