Space X's billionaire-funded Polaris Dawn mission will make history as an all-civilian crew embark on the world's first private space walk.
Starting shortly before 10.00am BST, the crew will open the hatch of their Dragon spacecraft and enter the deadly vacuum of space.
Billionaire Jared Issacman and SpaceX employee Sarah Gillis will then take turns exiting the vehicle, 435 miles (700km) above Earth.
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