天鵝座的另一太陽系, 雙太陽運行

車路仔2 · 發表於 2012-8-30 01:11:36

Coming less than a year after the announcement of the first circumbinary planet, Kepler-16b, NASA's Kepler mission has discovered multiple transiting planets orbiting two suns for the first time. This system, known as a circumbinary planetary system, is 4,900 light-years from Earth in the constellation Cygnus.

This discovery proves that more than one planet can form and persist in the stressful realm of a binary star and demonstrates the diversity of planetary systems in our galaxy.

Astronomers detected two planets in the Kepler-47 system, a pair of orbiting stars that eclipse each other every 7.5 days from our vantage point on Earth. One star is similar to the sun in size, but only 84 percent as bright. The second star is diminutive, measuring only one-third the size of the sun and less than 1 percent as bright.

barying · 發表於 2012-8-31 02:45:09

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車路仔2 · 發表於 2012-8-30 01:16:17

本帖最後由車路仔2 於 2012-8-30 01:18 編輯

內容:
The planets Kepler-47b and Kepler-47c: Kepler-47b has three times the radius of earth and orbits the pair of stars in less than 50 days while Kepler-47c is thought to be a gaseous giant, slightly larger than Neptune with an orbital period of 303 days.