Download Beyond Blue Skies: The Rocket Plane Programs by Chris Petty (.MP3)
Beyond Blue Skies: The Rocket Plane Programs That Led to the Space Age by Chris Petty / Narrated by Marlin May (Outward Odyssey: A People’s History of Spaceflight)Requirements: .MP3 player, 460 mbOverview: In 1945, some experts still considered the so-called sound barrier an impenetrable wall, while winged rocket planes remained largely relegated to science fiction. […]