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tupac225

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[交流] Similar orbits but 已有1人參與

Data from NASA’s Kepler
spacecraft have revealed two
extrasolar planets with similar
orbits around the same star but
radically different densities
— challenging planetary
formation theories.
Joshua Carter at the
Harvard-Smithsonian Center
for Astrophysics in Cambridge,
Massachusetts, Eric Agol at the
University of Washington in
Seattle and their team found
the two planets, which have
orbital periods of 14 and 16
days. The inner planet has a
density consistent with a rocky
planet like Earth, whereas
the outer one has the density
of a gaseous planet, such as
Neptune. This is puzzling to
theorists who had expected
gaseous planets to form much
further out, as in the Solar
System. When viewed from the
Earth-like planet, the Neptunelike
planet would be 2.5 times
the size of the Moon.
Science http://dx.doi.org/
10.1126/science.1223269 (2012)

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coasttocoast。

1樓 2012-08-14 16:02:27

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基極電流

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I wonder how does NASA get the density or mass of the two planets. By the orbital periods? Maybe one of the planet was not original generated by the star and was captured by it some day...

贊一下

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西湖太小

2樓2012-08-14 19:01:31

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