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Otherworldly triple play

Astronomers have discovered the first known system of three superEarths beyond the solar system

NANTES, France — Astronomers have discovered the first known system around a distant star with three planets categorized as superEarths.

The three extrasolar planets, all presumably rocky, range in mass from 4.2 to 9.4 times that of Earth. They orbit a star called HD 40307 just 42 light-years from Earth. HD 40307 has a mass about 80 percent that of the sun.

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