Is SLS still the most powerful rocket? 5 facts as Artemis 2 rolls out

NASA’s mega moon rocket will begin a slow trek to its Florida launchpad early Saturday, marking a major milestone for Artemis II, the agency’s first crewed lunar mission in over 50 years.

The rollout of the Space Launch System and Orion spaceship to a Cape Canaveral launchpad will kick off the final series of ground tests before NASA attempts to send four astronauts — Reid Wiseman, Victor Glover, Christina Koch, and Jeremy Hansen — on a 10-day flight into deep space. 

The journey begins at 7 a.m. ET Jan. 17...