I am verifying the answers generated by an automatic system to the following question: how many missions has the us sent to mars
Suggested answer: The Obama Administration proposed a revision of Constellation in 2010 to focus on the development of the capability for crewed missions beyond low earth orbit (LEO), envisioning extending the operation of the ISS beyond 2020, transferring the development of launch vehicles for human crews from NASA to the private sector, and developing technology to enable missions to beyond LEO, such as Earth/Moon L1 , the Moon, Earth/Sun L2 , near-earth asteroids, and Phobos or Mars orbit.
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