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Most spacecraft travel to Mars by an eliptical transfer orbit called a Hohmann Transfer. This normally takes 8 months one-way, and can only be done once every 2 years from Earth. This is not the quickest way to Mars, but it is by far the cheapest, so this is the one used most often.

If you had lots of money and energy, then quicker journeys are certainly possible. In the future ion propulsion engines (already in use on some satellites, e.g. GOCE) could be used to theoretically drop journey times to 40 days.

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13y ago

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