Reusable spacecraft engine tested in Mississippi

A giant cloud of vapor hovers over the A-2 test stand after an AR-22 rocket engine was test fired oat the NASA Stennis Space Center in Stennis, Miss., Monday, July 2, 2018. Triggering the 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]