A veteran caver who routinely explores the inner reaches of the earth offers readers a glimpse into this dark world where microbes that live without sunlight and typical food sources may change our views on evolution.
The microbes that caver Michael Ray Taylor calls "dark life" are found deep in the earth, in boiling oceanic vents, Antarctic ice, and lots of other places far from the reach of the sun's energy. These "extremophiles" are energy opportunists, subsisting on chemicals, radioactivity, or the faint light of molten rock. The study of these organisms is quite new, and scientists are learning that examining them may provide hints about the possibility of extraterrestrial life.
Dark Life is a first-person tour of the places Taylor has looked for archaebacteria and other strange microorganisms--Lechuguilla Cave in New Mexico, the hot springs of Viterbo in central Italy, NASA laboratories, and the halls of academia. Taylor met with passionate scientists searching for answers about how things can live deep in the earth and if they can survive in the unimaginable cold of outer space while hitchhiking on meteors.
Dark Life chronicles the triumphs and disappointments of this new field of science with engaging and personal stories.
The steady but frustrating progress of science is never more apparent than in the passages relating to the rise and fall of ALH84001. The potato-sized meteorite from Mars (and the scientists who analyzed it) enjoyed brief but frenzied attention when it was announced that microscopic forms in the rock may have indicated the presence of nanobacteria. But if you're expecting resolution to this question in Dark Life, be warned: to Taylor, it's the journey that's most exciting. --Therese Littleton
