This has led scientists to speculate on the existence of other galaxies.

这就使得科学家推测还有其他星系存在。

《牛津词典》

Recent findings lend strong support to the theory that a black hole lies at the center of the Milky Way and of many of the 100 billion other galaxies estimated to exist in the universe.

最近的发现有力地支持了这样一种理论，即银河系中心，和宇宙中估计存在的1000亿个其他星系中的许多里有一个黑洞。

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Astronomers see such jets in other galaxies.

天文学家在其他星系中看到了这样的气流。

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All galaxies,he said, are related to each other, much as members of a family are related to each other.

VOA: special.2009.04.29

Other galaxies, including our near-neighbor, the Andromeda, contain black holes hundreds of times more massive.

WSJ: Book Review: Gravity's Engines

Preliminary results from the team have uncovered five other galaxies which may have similarly large black holes.

FORBES: Astronomers Find One Of The Biggest Supermassive Black Holes Yet

No supernovae have been observed in our own galaxy since 1604, but astronomers have seen many supernovae in other galaxies since.

FORBES: Hubble Telescope Finds A Distant Supernova