As a planet orbits, it pulls a star back and forth.

当一颗行星绕它的轨道运行时，它能来回牵引恒星。

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Well, the planet orbits around the sun -- -- in some trajectory.

行星以某轨迹绕太阳运行。

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The planet orbits a dim red dwarf star 20 light years from Earth called Gliese 581.

这颗行星所绕行的是一颗暗淡的红矮星，距地球20光年远，名为Gliese 581。

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The planet orbits a star about half as big as our Sun, positioned some 9, 000 light-years away.

BBC: NEWS | Science/Nature | Planet hunters find 'super-Earth'

The planet orbits its host star, or brown dwarf, with an orbital radius similar to that of Venus.

BBC: Tiniest extrasolar planet found

Lying only 10 light years away in the equatorial constellation of Eridanus, it was already known to harbor at least one extra-solar Jupiter-like planet, which orbits the star roughly every 7 years.

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