Earth-Sized World Could Lurk in Outer Solar System
Monday, January 4, 2010 - 07:21
in Astronomy & Space
The possibility of finding a planet the size of Mars or even Earth is higher than ever with the launch of NASA's WISE telescope. Several prominent astronomers have said for years there could be another good-sized world out there -- long called the theoretical 10th planet -- and WISE is not the only telescope on the hunt.