Professor Tim O'Brien
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Are we a step closer to getting humans on Mars?

4 December 2014 Last updated at 08:56 GMT

An American space capsule that could help get humans to Mars is making its first test flight on Thursday.

The Orion capsule will be launched into space on a powerful Delta rocket from Cape Canaveral in Florida.

Professor of Astrophysics, Tim O'Brien, talks to Ricky about whether we are a step closer to getting humans on Mars.

More on this story - 'Mars ship' set for test flight.