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The main problem of realization the plan is financial.
Bush's proposed NASA budget for next year is $17.6 billion, including $4 billion for the Constellation Project, the return trip to the moon envisioned by the president by 2020. It will probably take a little more time, considering lack of money.
Another issue is the simple matter of maintaining a space infrastructure of rockets and scientists capable of executing such a complex assignment as a trip to Mars. Most of the space scientists who led the United States to the moon in the 1960s are retired.
Besides, the route of getting to Mars, charted by Bush and his advisers four years ago, should be reconsidered. That plan envisioned setting up a permanent base station on the moon, possibly using resources there to produce fuel for rockets destined for Mars and beyond.
They hope that a new president will help to solve the main problems.
Source: By Pravda.ru