Astronomers say most galaxies collide with another at some point in their lifetimes.

天文学家说大多数星系只在某个特定的时刻才会与其它星系发生碰撞。

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Red dwarfs are also common -in fact, astronomers say they are the most common type of star in the galaxy.

事实上红矮星也很常见，天文学家认为它们是星系中最常见的星体。

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Red dwarfs are also common - in fact, astronomers say they are the most common type of star in the galaxy.

事实上红矮星也很常见，天文学家认为它们是星系中最常见的星体。

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Astronomers say it was probably less than one kilometer in size too small to see from Earth.

VOA: special.2009.08.25

Astronomers say that Mola's data are giving them a new view of the volcano.

BBC: New view of giant Martian volcano

Astronomers say they have found a planet orbiting a distant star that's more like the Earth than any other found so far.

NPR: Astronomers Find Planet with Similarities to Earth

Astronomers say the sun has been relatively quiet for some time.

WSJ: Solar Flare: Sun Flare Leads to Solar Storm Reaching Earth