Washington DC company United SpaceStructureswants to create a new space station It rotates six times a minute to create artificial gravity - with the 'stem' and 'dome spinning in opposite directions It would be 1,300ft (400 metres) long, cost 200 billion ($300 billion) and take 30 years to build We believe artificial gravity is required to support long term living in space, Bill Kemp from USS told MailOnline

By Jonathan O'Callaghan for MailOnline

Published: 04:53 EST, 8 April 2015 | Updated: 06:20 EST, 8 April 2015

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One problem with space travel is that humans arent very good at coping with reduced gravity - their bones and muscles deteriorate over time.

But one company says they have an answer - a giant rotating space cylinder that can create artificial gravity.

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A Washington DC-based company called United Space Structures wants to create a new space station. Their giant cylinder (shown, with the ISS and Space Shuttles illustrated) could apparently replace the ISS. It would rotate six times per minute to create artificial gravity, and would be 1,300ft (400 metres) long, cost 200 billion ($300 billion) and take 30 years to build

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Could this $300 billion 'space mushroom' replace the ISS?