NASA begun fueling its moon rocket Wednesday for humanity’s first lunar trip in more than half a century, aiming for an evening liftoff with four astronauts. Tensions were high as hydrogen fuel started flowing into the rocket hours ahead of the planned launch.

As launch time approaches for NASA's first moonshot in more than half a century, anticipation is building for the Artemis II mission. Here's how to watch today's liftoff.

The Artemis 2 mission is due to send astronauts on a test mission to the moon and back during the "opening act" of a new age of discovery.