嘿，邻居，这是世界太空周！(Hey neighbour, it's World Space Week!)

太空是一个又大又孤独的地方，所以很高兴知道我们有邻居。照片中的仙女座星系是我们银河系中最近的星系，就在250万光年之外的隔壁。我们与仙女座星系的亲密关系可以追溯到大约100亿年前，当时两个星系都还在形成。但麻烦正在酝酿之中——仙女座正在与银河系发生碰撞，预计将在40亿年后发生碰撞。这一带就要闹起来了…
原文：
Space is a big, lonely place, so it's nice to know we have neighbours. The pictured Andromeda Galaxy is our Milky Way's closest – right next door at 2.5 million light-years away. Our cordial relationship with Andromeda goes back about 10 billion years to when both galaxies were still forming. But the trouble is brewing – Andromeda is on a collision course with the Milky Way, due for impact in 4 billion years. This neighbourhood's about to get rough…
《© NASA/JPL-Caltech》