So, could be that we send a probe to Mars to grow algae and the terraforming begins. Over a few million/billion years life evolves, and then intelligent life. Meantime, our planet goes to shit and we die off. The descendant Martians take a look at earth and think “we could Marsaform that place” and send a probe with bacteria. Meantime they die off, and on earth a new intelligent life begins to evolve. . . . . and so on and so on.
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