This is it! Scientists have finally found definitive proof of an advanced alien civilization of incredible power!
Are there really alien civilizations out there that we don't know about? Find out on this Moment of Science: "The Fermi Paradox".
Could aliens come down to earth to eat us? Find out on this Moment of Science.
Scientists explain the inevitable collision by speculating that the Milky Way and Andromeda galaxies are a bound pair, meaning that they are in orbit around each other.