Reusable spacecraft engine tested in Mississippi

Employees and media view an AR-22 engine, being used for a developmental reusable spacecraft, in Stennis, Miss., Monday, July 2, 2018. Triggering a massive cloud of vapor and a roar, officials on Monday test fired the rocket engine designed to be part of a reusable spacecraft that can launch into space repeatedly with a quick turnaround time. [Photo: AP /Gerald Herbert]