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When Will Humans Visit Mars? This Physicist Says There Are 'Real Plans' For The 2030s

Michio Kaku, a theoretical physicist and the co-founder of string field theory, gives a lecture in 2012. (Yasuyoshi Chiba/AFP/Getty Images)
Michio Kaku, a theoretical physicist and the co-founder of string field theory, gives a lecture in 2012. (Yasuyoshi Chiba/AFP/Getty Images)

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