The amazing Discovery Channel series When We Left Earth comes out on DVD and Blu-Ray today, and it's a mindblowing look at four decades of off-world exploration. Simultaneously grand and intimate, the series lets you glimpse just how harrowing and freaky an astronaut's life could be back during the peak of the space race. We've got three exclusive clips and some gorgeous stills, below. For some reason each one of these clips starts out with the same intro, but they really are totally different. Especially scary is the one where a design flaw meant that astronauts couldn't use their spare air capsules, and they didn't have enough oxygen for three astronauts otherwise. The astronauts had to build an "adaptor" to fit a square peg to a round hole, using duct tape and an old sock, while suffocation loomed in their near future. Special features on the DVD and Blu-Ray include an extra four hours of footage, a rare interview with first man on the moon Neil Armstrong, and a 14-page booklet with a timeline of major NASA events. You can order the DVD here and the Blu-Ray here.