When you shine a flashlight into the night sky, the light speeds away from you at 186,000 miles per second. If the light escapes the Earth's atmosphere, it can soar through outer space and on to the stars. How would you like to stow aboard that flight? In this book, you can catch a ride on a light beam as it travels across our solar system and through our galaxy. Head to the distant edges of our universe--and find out why you might just end up back home!