In Houston, Texas, NASA revealed that a manned mission to Mars may occur in 2031. Estimates of the cost of such a project range from $20 billion to $450 billion. The round trip of the mission is expected to last around 30 months. The spacecraft is planned to be built in orbit, due to the great size that it will need to be for the mission.
Source:
http://www.theregister.co.uk/2007/11/29/nasa_mars/
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