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Mars has always been visible to anything that has looked up into the night sky. In that sense it was not "discovered".

As the motion of Mars is so different from that of the "fixed stars" (when you observe it over weeks and months) that the planet was known to be different from the other specks of light that are stars. Along with Mercury, Venus, Jupiter and Saturn, Mars was "discovered" long before written history began.

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∙ 16y ago

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