How long to get to Mars
http://www.universetoday.com/14841/how-long-does-it-take-to-get-to-mars/
How difficult is it to land on mars
http://www.universetoday.com/7024/the-mars-landing-approach-getting-large-payloads-to-the-surface-of-the-red-planet/
Why have so many missions to Mars failed
information about interplanetary orbits.
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