A spacecraft slowly descends to the surface of Mars. Once arid and lifeless, the Red Planet is now lush and green. As a city comes into view, passengers see people strolling along busy streets, venturing into a park and breathing the Martian air.
Many science fiction writers have envisioned futures like this for Mars. In these stories, humans use terraforming technology to make other planets more Earthlike. It’s a huge challenge. To start, Mars would need an atmosphere with enough oxygen and that’s thick enough to retain heat, allowing water to exist as a liquid.
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