What shall we do with Mars?

http://www.brainpickings.org/index.php/2012/08/08/carl-sagan-message-to-mars/
The surface area of Mars is exactly as large as the land area of the Earth. A thorough reconnaissance will clearly occupy us for centuries. But there will be a time when Mars is all explored; a time after robot aircraft have mapped it from aloft, a time after rovers have combed the surface, a time after samples have been returned safely to Earth, a time after human beings have walked the sands of Mars. What then? What shall we do with Mars? ~ Carl Sagan
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