IT ISN’T EASY being an organism. In the whole universe, as far as we yet know, there isonly one place, an inconspicuous outpost of the Milky Way called Earth, that will sustain you,and even it can be pretty grudging.

From the bottom of the deepest ocean trench to the top of the highest mountain, the zonethat covers nearly the whole of known life, is only something over a dozen miles—not muchwhen set against the roominess of the cosmos at large.

For humans it is even worse because we happen to belong to the portion of living thingsthat took the rash but venturesome decision 400 million years ago to crawl out of the seas andbecome land based and oxygen breathing. In consequence, no less than 99.5 percent of theworld’s habitable space by volume, according to one estimate, is fundamentally—in practicalterms completely—off-limits to us.

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