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"It's actually quite expensive to go to Mars. You can buy measles vaccines and save lives for $1,000 (£814) per life saved," he told the BBC."And so [that] just kind of grounds you, as in - don't go to Mars."Fellow entrepreneur Elon Musk has said he wants to colonise Mars, while Jeff Bezos has also joined the "space race".SpaceX, the rocket company co-founded by Mr Musk in 2002, has made it an ultimate goal to send crewed flights to Mars and eventually colonise the Red Planet.