The Andromeda Galaxy, also known as M31, is the closest major galaxy to our own Milky Way, and it's currently hurtling towards us at a speed of about 250,000 miles per hour.
This galactic collision is expected to occur in about 4.5 billion years, but don't worry, it won't be a catastrophic event. Instead, the two galaxies will merge to form a new, larger galaxy. It's a reminder of the dynamic and ever-changing nature of the universe.