Upwards of a billion stars in our galaxy have burnt up their internal energy sources, and so can no longer produce the heat a star needs to oppose the inward force of gravity.

在我们的星系中，超过10亿颗恒星已经耗尽了它们的内部能量来源，因此无法再产生恒星所需的热量来对抗向内的引力。

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If the center of NGC 4258 were a star cluster, the stars would be so closely spaced that collisions between individual stars would have long ago torn the cluster apart.

如果 NGC 4258 的中心是一个星团，恒星之间的距离会非常近，以至于在很久以前单个恒星之间的碰撞就会把星团撕裂。

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Once again the stars blew the window open, and that smallest star of all called out, "Cave, Peter!"

星星们又一次把窗户吹开了，他们当中那颗最小的星星大声叫道：“快跑，彼得！”

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I could see a thousand stars. As I stood there I turned my eyes to a large red star.

VOA: special.2010.07.10

Every year we pick a theme, this year's theme was movie stars and Star Festival.

每年我们都选择一个主题，今年的主题是电影明星和七夕。

麻省理工公开课 - 媒体、教育、市场课程节选

The program was named for the two stars Castor and Pollux in the star group Gemini.

VOA: special.2009.06.24

Ramone was "the star of stars behind the stars, " Wonder said.

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Depending on its initial mass, it might collapse to a compact hot star known as a white dwarf (when the star's mass is less than 1.4 times the mass of our sun) or to a neutron star (for stars 1.4 to about three times the mass of our sun) or to a black hole (for stars more massive than three times the mass of our sun).

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These might include, for example, binary stars, where one star orbits another, blocking some of the light as the stars transit each other.

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