NASA will deliver the SLS Moon rocket two days early to the launch pad.

NASA will deliver the SLS Moon rocket two days early to the launch pad.

This bodes well for NASA's intentions to launch the rocket for the first time in August or September 2022.

This bodes well for NASA's intentions to launch the rocket for the first time in August or September 2022.

NASA's first SLS rocket will launch from Kennedy Space Center's LC-39B pad on August 16 at 9 p.m. EDT.

That will kick off two weeks of preparation that could culminate in the rocket's first real launch attempt on August 29.

Congress created SLS in 2010 to replace the Space Shuttle with a heavy-lift rocket.

NASA built a rocket that expanded Shuttle external tank technology into a larger liquid hydrogen/oxygen 'core stage' (SSME; now RS-25).

The core stage would be topped by a Delta IV orbital stage and two Shuttle-derived solid rocket boosters (SRBs)

If SLS launches in the next several months, it will be the world's most powerful rocket.

SpaceX's Starship, which will launch a NASA Moon lander, will compete or beat SLS in 5-10 years.

Lockheed Martin began building an older version of NASA's Orion spacecraft in 2006.

Orion's Command module will be better than Apollo's, but its Service module will be worse.

NASA's Gateway station has complicated the mission of new Moon landers like SpaceX's Starship.