It's set to revolutionise the way we view the Earth from space. Two special cameras, designed and built by scientists in South Oxfordshire, have blasted off to the International Space Station, ready to reveal video and images of our planet, never seen before.
Cary Johnston took a trip to the final frontier.
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Showers this evening then dry overnight.
Showers this evening then becoming dry but cloudy overnight.
The Prime Minister praised the armed forces as she joined celebrations in Liverpool.