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Astronomers ponder how a newly discovered low-density super-giant planet formed.
12.10.06
A recent addition to the 200-member list of worlds beyond our solar system stands above the crowd. The planet orbits a star 450 light-years from Earth and is the largest planet found to date, measuring 36-percent wider than Jupiter. The catch: Planet HAT-P-1b also has the lowest density of any planet yet found.
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