In addition to all of these previously mentioned hazards, there are three more major risks involved with a manned mission to Mars. One of these risks is the lack of real-time transmission from Mission Control. Considering the large distance between Mars and Earth, it takes about 20 minutes for a signal to travel from Mars to Earth. So if the astronauts were to encounter a severe problem with their equipments, they will have to wait for roughly 40 minutes to get a solution from Mission Control. During this idle time, the astronauts are at risk.
http://www.spacescan.org/entry/top-10-risks-in-manned-mission-to-mars/
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