NASA unveils 'the most powerful rocket ever built'

NASA has unveiled what it's calling the "most powerful rocket ever built" -- which is a pretty bold claim. But maybe bold is exactly what the space agency needs, considering how behind it is on its mission to put astronauts on the moon again. The new Space Launch System, or SLS, is expected to carry astronauts to the moon in 2024 as part of NASA's Artemis project.