Why haven't we gone to mars yet? In the 60s we went from barely scratching Earth's orbit to landing a few guys on the Moon in ten years.With the amazing advancements in technology, what's been keeping mankind's collective feet reserved to a single planet for the last forty years?
http://www.usatoday.com/tech/science/space/story/2012-09-02/Mars-obstacles-for-humans/57516356/1
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