The four astronauts on the Artemis II mission have now left the Earth's orbit, after their Orion spacecraft fired its main engine for a final push towards the Moon.

And from the Orion capsule, Canadian astronaut Jeremy Hansen said the crew was "feeling pretty good up here on our way to the Moon".

Artemis II is now on a looping path that will carry the crew around the far side of the Moon and back again.

It is the first time since 1972 that humans have travelled outside of the Earth's orbit.

Hansen, who is the first non-American to travel to the Moon - told Nasa's mission control that the crew "firmly felt the power" of those who have persevered and worked so hard on this mission.

"Humanity has once again shown what we are capable of," he said.

"It's your hopes for the future that carry us now on this journey around the Moon. "

At last, the final approval was given, and the engine burn could begin - the mission's last, big move towards the Moon.

The TLI propelled the spacecraft on a journey that is expected to carry the crew farther from Earth than anyone has been before - more than 4,700 miles (7,600 km) beyond the Moon - before gravity swings them back.

Nasa estimates that this could edge past the record set by Apollo 13 in 1970, depending on the fine details of the timing and trajectory.

TLI is not a point of no return for Orion - even after the big burn to the Moon, controllers can still carry out the equivalent of a handbrake turn in space and bring the crew back to Earth if something goes seriously wrong.

In the event of an emergency, the U-turn is the fastest way home in the first 36 hours after the TLI.

After that it can be just as quick, and often simpler, to stay on course around the Moon and fall back to Earth, Orion programme manager Howard Hu said before the launch. He added that the team have "run hundreds of thousands of [simulations] to ensure that we are able to get the crew home safely. "

As Orion surges into deep space, the views through its windows will become steadily more inspirational: the Earth shrinking to a small blue and white marble behind them, while the Moon grows from a bright disc into a heavily cratered world filling the frame.

On about the sixth day of the mission, as Orion cruises beyond the Moon, the astronauts will get to see a total solar eclipse.

The Moon will slide directly in front of the Sun so its bright face is completely covered to reveal its normally concealed shimmering halo, with Earth hanging off to one side

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