The vacuum chamber will test Orion’s ability to withstand both freezing and scorching temperatures in the vacuum of space.
NASA said: “Completed in two phases inside the world’s largest vacuum chamber, testing will begin with a thermal test, which will last approximately 60 days, while Orion’s systems are powered-on under vacuum conditions that simulate the space environment.
“During this phase, the spacecraft will be subjected to extreme temperatures, ranging from -250 to 300-degrees Fahrenheit, to replicate flying in-and-out of sunlight and shadow in space.”
During a second stage of testing, the spacecraft will be subjected to an “electromagnetic interference and compatibility” test.
source: express.co.uk