Why Should We Ever Send Humans to Mars?

Slate has relationships with various online retailers. If you buy something through our links, Slate may earn an affiliate commission. We update links when possible, but note that deals can expire and all prices are subject to change. All prices were up to date at the time of publication. Adapted from The End of Astronauts: Why Robots Are the Future of Exploration by Donald Goldsmith and Martin Rees, published by the Belknap Press of Harvard University Press.