Nasa has successfully launched its most powerful-ever rocket, as part of a plan to eventually return humans to the Moon - watch live video at the top of his page
"We rise together, back to the Moon and beyond", exclaims a giddy space agency official
The Space Launch System took off from its Florida launch site at 06:47 GMT (01:47 local time) - a historic moment for Nasa
The first Artemis I launch failed at the end of August due to technical glitches, while a second attempt at the start of September was hampered by a fuel leak
A planned third attempt in late September was delayed due to a tropical storm Ian
The mission involves using a huge rocket to send uncrewed capsule Orion around the back of the Moon
Nasa wants to send astronauts back to the lunar surface by 2025, for the first time in more than 50 years

Why does Nasa want to return to the Moon?
A key talking point around the Artemis launch is why now - and why the Moon when we've already been?

In Nasa's own words, it is “going back to the Moon for scientific discovery, economic benefits, and inspiration for a new generation of explorers”.

The long-term goal of the Artemis programme is to establish a space station and a lunar base camp on the Moon, so astronauts can eventually spend much longer periods of time there.

After that, the space agency wants to enact its "Moon to Mars" programme - with a current goal to have people on Mars in the next 20 years. (The journey to the Moon takes three days but reaching Mars is a far lengthier and trickier goal.)

In the short term, 10 shoebox-sized satellites called CubeSats will drop off once Orion is approaching the Moon. They will conduct a range of science experiments and technology demonstrations in deep space.

Technology has massively improved since the Apollo programme of 1961, meaning there's a greater chance this time around of learning even more about the Moon and space in general.