alien galaxies
外星星系
以上为机器翻译结果，长、整句建议使用 人工翻译 。
They actually said that one of the stars you see in the spectra is an alien. It comes from a different galaxy. There is interaction of galaxies.
他们说，其实你在光谱中看到的恒星之一就是外来的，它来自不同的星系，有相互作用的星系。
youdao
Forty-two radio dishes, each 20 feet in diameter, were powered up on Oct. 11, to scope out galaxies, black holes, and--maybe, just maybe--alien civilizations.
FORBES: Magazine Article
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