"Four billion years from now, our galaxy, the Milky Way, will collide with our large spiraled neighbor, Andromeda.
The galaxies as we know them will not survive.
In fact, our solar system is going to outlive our galaxy. At that point, the sun will not yet be a red giant star – but it will have grown bright enough to roast Earth’s surface. Any life forms still there, though, will be treated to some pretty spectacular cosmic choreography."