They Came From Earth: The Attack Of The Space Germs

Microorganisms, found virtually everywhere on Earth, linger even in NASA’s “cleanrooms”—surely among the most pristine places on the planet. If we’re going to be looking for life elsewhere, we don’t want to bring Earth there,” says Rakesh Mogul, professor of biological chemistry at California State Polytechnic University at Pomona.

This story appeared Forbes on June 26.