In order for the SOFIA telescope to be able to view the sky, the 747-SP had to have this special door built into it. The door is designed to be opened while in flight, even while the plane is in the stratosphere.
July 13, 2012 4:00 AM PDT
Photo by: Daniel Terdiman/CNET
| Caption by: Daniel Terdiman
Conversation powered by Livefyre