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. Read our full story on Engadget: Get More Engadget: • Like us on Facebook: • Follow us on Twitter: • Follow us on Instagram: • Read more: