I suspect the "arms race" during the Cold War was a primary motivator for sending a man to the moon. NASA is probably holding back because Mars is far away and launching a rocket requires extensive preparation. We only have satellites taking images of the terrain on Mars but the actual climate is still open to speculation.
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good point...but i was told that we went to the moon like 11 times and now we dont know how to send anyone to the moon for some reason. i was reading up on the ORION project to go to mars and they were having problems with going pass the VAN ALLEN RADIATION BELT. This I thought was kinda funny considering the moon is past the Radiation belt.
It could be because NASA is afraid to support Trump given his more incendiary comments. I'm not surprised NASA is hesitant because they are low on funds. Also, if valuable resources were found on Mars, then astronauts would be there in a flash.