Jonathan Cieri

Just before the trans-lunar injection, that's that critical rocket burn where they fire the main rocket for about six minutes to leave a relatively low Earth orbit and begin their trajectory to the moon.

They got a warning of a suspected cabin leak.

The astronauts worked with engineers on the ground to troubleshoot.

They determined it was a false alarm, and then they were able to move forward with that critical burn.

The Artemis II astronauts have been sending back dramatic pictures of the Earth.

When they pass behind the far side of the moon on Monday, they're likely to see features previously captured only by satellite images.

Already, they're seeing the moon from a different angle than the rest of humanity.