tonight artemis 2 will face its greatest challenge yet safely returning to ear in a few hours orion will hit the atmosphere at nearly 25 ,000 miles an hour generating extreme heat and a six-minute long communications blackout and protecting the crew is a heat shield that nasa has acknowledged is flawed MS Now's Josh Einiger is live from NASA's Mission Control Center in Houston. Also with us, Colonel Chris Hadfield, a retired astronaut and former commander of the International Space Station as well as author ...