When astronomers look into the night sky, almost every single galaxy is speeding away from us, carried by the expansion of the Universe. There’s one notable exception; though, the massive Andromeda galaxy (aka M31), which is speeding towards us at a rate of 120 km/s. And some time in the next few billion years, our … Continue reading "When Our Galaxy Smashes Into Andromeda, What Happens to the Sun?"