Mars Exploration The planet Mars could be the place human space explorers head next. But the danger -- not to mention the expense -- leads many researchers to question how much humans can do when they get there that a well trained robot couldn't. David Kestenbaum reports on the dream and the downside of human space exploration.

Mars Exploration

Mars Exploration

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The planet Mars could be the place human space explorers head next. But the danger — not to mention the expense — leads many researchers to question how much humans can do when they get there that a well trained robot couldn't. David Kestenbaum reports on the dream and the downside of human space exploration.