Canadian astronaut Chris Hadfield has spent a total of six months in space. In his new book, he writes that getting to space took only "8 minutes and 42 seconds. Give or take a few thousand days of training." NASA/Courtesy of Little, Brown and Company hide caption

itoggle caption NASA/Courtesy of Little, Brown and Company

Your direct connection with the stars and all of the space in between them. iStockphoto.com hide caption

itoggle caption iStockphoto.com

NASA's Lunar Atmosphere and Dust Environment Explorer probe, seen in this artist's rendering, is orbiting the moon to gather detailed information about the lunar surface. Dana Berry/NASA hide caption

itoggle caption Dana Berry/NASA

If Gravity carries a clear message, it is that the universe is hostile to life. Courtesy of Warner Bros. Pictures hide caption

itoggle caption Courtesy of Warner Bros. Pictures

Even if we find other life out there, in the depths of space, life here will still be a rare gem that must be worshipped and preserved at all costs. ESO hide caption

itoggle caption ESO

A photo composed of nearly 900 images taken by the rover Curiosity shows a section of Gale Crater near the equator of Mars. The rovers are continuing to work through the U.S. government shutdown. NASA/AP hide caption

itoggle caption NASA/AP

British theoretical physicist Peter Higgs (left) and Belgian theoretical physicist Francois Englert were awarded the Nobel Prize in physics on Tuesday. Fabrice Coffrini/AFP/Getty Images hide caption

itoggle caption Fabrice Coffrini/AFP/Getty Images