Saturday, July 20, is Moon Day and the 55th anniversary of the first Apollo 11 moonwalk. Here’s a look at the Apollo program and the new Artemis program to return to the lunar surface. NASA will now ...

CC0 Usage Conditions ApplyClick for more information. The Rocketdyne J-2 Liquid-Fuel Motor, using liquid hydrogen and liquid oxygen, was the powerplant for the second and third stages of the Saturn V ...