NASA's J-2X Engine
This image is from a 2008 cold flow test campaign conducted at NASA's Marshall Space Flight Center for the J-2X engine program.
NASA continues to test the J-2X engine and conducted a 40-second test of the rocket engine Sept. 28, the most recent in a series of tests of the next-generation engine selected as part of the Space Launch System architecture that will once again carry humans into deep space. It was a test at the 99 percent power level to gain a better understanding of start and shutdown systems as well as modifications that had been made from previous test firing results.
Image Credit: NASA