Nasa calls off new Artemis mission to Moon - BBC News

Nasa has called off the launch of its big new Moon rocket - the Space Launch System (SLS). Controllers struggled to get an engine on the 100m-tall vehicle cooled down to its correct operating temperature. They had previously worried about what appeared to be a crack high up on the rocket but eventually determined it was merely frost build-up. The SLS is the biggest rocket ever developed by Nasa. It will be used to send astronauts back to the Moon.