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Scientific interest in extraterrestrial life has grown in the past 20 years. The field of astrobiology now includes researchers from a wide variety of disciplines — microbiologists studying bacteria that survive in the most extreme conditions on Earth; astronomers who believe there may be billions of planets with conditions hospitable to life; chemists investigating how amino acids and living organisms first appeared on Earth; and scientists studying rocks from Mars are seeing convincing evidence that microbial life existed on the Red Planet.

In First Contact: Scientific Breakthroughs in the Hunt for Life Beyond Earth, Marc Kaufman, a science writer and national editor at The Washington Post, explains how microbes found in some of Earth's most inhospitable environments may hold the key to unlocking mysteries throughout the solar system.

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Category: Science