It has so many advantages--it preserves Martian life, requires fewer interplanetary launches, and makes it much easier to field-test Mars rovers.

"Marsiforming", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License

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It has so many advantages--it preserves Martian life, requires fewer interplanetary launches, and makes it much easier to field-test Mars rovers.