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This image courtesy of Harvard-Smithsonian Center for Astrophysics shows an artist's …
An odd pair of distant worlds -- one rocky like Earth and another gassy like Neptune -- have been found doing the closest dance of any planetary pair ever discovered, US scientists said on Thursday.
The duo are orbiting their star about 1,200 light years from Earth, and were discovered with NASA's Kepler space telescope, which launched in 2009 in search of Earth-like planets orbiting stars similar to our Sun.
Their star is probably a lot like our Sun but several billion years older, and the planets are much closer to it, said the study in Science Express, the online edition of the journal Science.
'Odd couple' planets do extreme tango
