Distant Mirrors.

"'This is a landmark discovery because it implies that solar system analogs may be very common, at least scaled-down versions,' said Sara Seager, an extra-solar planet expert from the Massachusetts Institute of Technology. '...We are on an inexorable path to finding other Earths.'" Astronomers find a solar system not unlike our own 5,000 light years away. "We are seeing the emergence of a new planet-finding technique -- one that opens up an entirely new capability for planet finding. It is more powerful than we ever thought possible."