For more than 60 years, nearly every large rocket used some combination of the same liquid and solid propellants. Refined ...

Add Yahoo as a preferred source to see more of our stories on Google. NASA's Space Launch System rocket and Orion spacecraft, pictured here on February 1, are currently on Launch Pad 39B at Kennedy ...

NASA fueled up its giant lunar rocket and completed a launch-day walkthrough on Thursday ahead of its highly anticipated mission to send four astronauts around the moon. The hourslong test, known as a ...

(CNN) — If all had gone according to plan, four astronauts might have been returning just this week from a history-making, 10-day slingshot trip around the moon. Instead, NASA’s engineers have been ...