Does light from distant galaxies really take billions of years to reach Earth? Is time-travel possible? Are black holes real? What are some of the weird effects of traveling at near the speed of light? And how do we really know? The physics discovered by Albert Einstein allows us to answer all of these questions. In this easy-to-read book, we learn how Einstein was able to deduce what happens when an object approaches the speed of light. The results are as amazing as they are strange. Designed for readers with no background in physics, this book explores one of the strangest and most fascinating branches of science.