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Astronomers discover smallest planets yet seen outside solar system.
Byline: Robert S. Boyd
WASHINGTON _ Rival teams of European and American astronomers have detected the three smallest planets ever seen outside the solar system _ possible "super-Earths" about the size of Neptune and Uranus that are orbiting nearby stars.
Two to three times bigger and 14 to 21 times heavier than our own Earth, the planets are major milestones on the quest to find Earthlike bodies that might support life.
"These discoveries are going to bring us closer to answering the question: Are we alone in the universe?" Anne McKinney, the director of NASA's Universe Division, said at a Washington news conference Tuesday.
In addition, a fourth new planet _ a so-called "gas giant" about the size of Jupiter _ was reported Aug. 24 by another American group, making the week an extraordinarily successful one for ...
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Source: HighBeam Research, Astronomers discover smallest planets yet seen outside solar system.