Our nearest neighbor, the Andromeda galaxy, is speeding toward the Milky Way at 250,000 miles per hour and will crash into us in 3.75 billion years. The good news is that because of the vast distances between stars, it’s unlikely that any stars will actually collide. Before you mark this event on your calendar, however, remember that our sun is continually growing. About 3 billion years from now, the sun will be 40 percent larger than its current state and all life on Earth will probably cease to exist. Read more →