SpaceX fired one of its Raptor engines last month to test its ability to land the company's Starship vehicle on the moon in cold conditions, which it will have to do on the Artemis 3 mission.

SpaceX Starship engine passes key test for Artemis 3 moon-landing mission (video)

Source: space
Source Link: https://www.space.com/spacex-starship-raptor-engine-artemis-3-cold-moon-landing-test