Dear Urban Astronomer
I recently read that the andromeda system is our closest neighbour. Apparently, our galaxy is on a crash course with the andromeda system. They make it sound like its going to happen in the next few decades. I was just curious how much bigger is andromeda? How close is it to us? And how close are we to impact. Thanks in advance,
First thing first, we are indeed on a collision course with the Andromeda Galaxy, but we've got rather more than just a few decades to get our affairs in order, so I wouldn't worry too much just yet.