An Orion test capsule sits inside a temporary clean room in High Bay 3 of the Vehicle Assembly Building.

An Orion test capsule sits inside a temporary clean room in High Bay 3 of the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida during testing. The clean room, built by Astrotech, uses air flow produced by two banks of fans to keep particles from settling on the surface of a spacecraft during processing. Engineers are considering using the design in the future to protect the spacecraft after it is secured to the top of the Space Launch System rocket. Photo credit: NASA/Dmitri Gerondidakis