In this picture, the Earth-moon system actually appears to be a double planet.

照片中，地月系统实际上看上去像一颗双行星。

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Astronomers using the Kepler telescope found the first known double-star planet just last September Kepler-16, a gassy oddball orb the size of Saturn that circles a pair of stars 200 light-years from Earth, like the planet Tatooine in the "Star Wars" films.

WSJ: Galaxy Hosts 100 Billion Planets, in New Estimate

Astronomers using the Kepler telescope found the first known double-star planet just last September Kepler-16b, a gassy oddball orb the size of Saturn that circles a pair of stars 200 light-years from Earth, like the planet Tatooine in the "Star Wars" films.

WSJ: Galaxy Hosts 100 Billion Planets, in New Estimate

Using nineteenth-century birth rates, he projected that the number of people on the planet would double three times every century.

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