Jun 27, 2015. Traveling at the speed of light, how long would it take to get to the next galaxy? Thank you for you greatly, appreciated, time. The closest galaxy is the recently discovered Canis Major dwarf galaxy, which is "only" 25,000 light-years away. So it would take 25,000 years to get there if you traveled at the speed. Here, explore the logic behind Einstein’s astounding insight, and play with…