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We will never know who first discovered Mars. The Egyptians from 1570 B.C. called Mars by the god name of "Horus of the Horizon" and depicted it as a man with a hawk's head. They also observed the planet "going backwards" refering to what we now know as retrograde motion. Aristotle (384BC- 322BC) was among the first known writers to set down observations of Mars.
Mars has always been visible to the naked eye of man kind, so this question would be impossible to answer.

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7y ago

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