Red Bull Stratos
The launch of the helium balloon seen during the unmanned flight for Red Bull Stratos, a mission to the edge of space to break the speed of sound in freefall, at Roswell, N.M., on Jan. 18, 2012. The Red Bull Stratos exhibit will be on display at the National Museum of the U.S. Air Force from Jan. 24-March 16, 2014. (Photo courtesy of Red Bull Stratos)