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Earth-sized planets may be more common than we thought（图）
Earth-sized planets an Earth-mass planet low-mass planets
2010/10/28
Almost one in four stars like the Sun could harbour an Earth-mass planet, according to US researchers. Their finding questions conventional models of planetary formation, which suggest that it is rare...
Chemical signature could help locate Earth-like planets（图）
Chemical signature Earth-like planets
2009/10/16
New insights into the Sun's chemical composition may provide a new way to search for Earth-like planets orbiting distant stars – claims an international team of astrophysicists.Astronomers have alread...