At least one supernova occurs per decade in our galaxy.

每十年至少有一颗超新星在我们的银河系中出现。

《柯林斯英汉双解大词典》

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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Since the lifetime of a planet like ours is several billion years, we can expect that, if other civilisations do survive in our galaxy, their ages will range from zero to several billion years.

由于我们这样的行星的寿命是几十亿年，我们可以预测，如果我们星系中有其他生物生存，它们的年龄将从零到几十亿岁不等。

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That makes it at least equal in size to the largest galaxy in our local group, the Andromeda Galaxy.

VOA: special.2009.01.20

Mr. Reid said: "No longer will we think of the Milky Way as the little sister of the Andromeda Galaxy in our Local Group family."

VOA: special.2009.01.20

After 50 years of silence, I think the time has come to take stock and say, maybe we should mobilize all of the sciences to look for anything fishy, anything weird,any anomaly, both in our own little corner of the universe here on Earth and in the solar system, and far out across the galaxy."

VOA: standard.2010.04.16

There are tens of thousands of black holes, which can be formed by massive dying stars, in our galaxy, Levin said.

CNN: Cosmic music from dying stars

The current research estimates that there are at least 361 intelligent civilisations in our Galaxy and possibly as many as 38, 000.

BBC: Number of alien worlds quantified

"We now know the rate of occurrence of habitable planets around the most common stars in our galaxy, " said Prof Charbonneau.

BBC: Exoplanets near red dwarfs suggest another Earth nearer