By Stuart Kallen
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Extra info for The Search for Extraterrestrial Life
It contains vocal greetings in 55 languages. Other common sounds such as the wind, the surf, a human kiss, laughter, and noises made by different animals such as crickets, elephants, and wild dogs are included. The record holds 90 minutes of music from around the world with traditional songs from Africa, the Americas, and Asia, classical music from Johannes Bach and Mozart, and even the classic rock and roll song “Johnny B. Goode,” recorded in 1958 by Chuck Berry. In addition to sounds, the Voyager Golden Record contains 116 digital images.
Scientists discovered an unusual group of microbes living inside The first extremophiles rocks of the Norris Geyser Basin in were observed in 1977 2005. The acidophiles belong to a living in hydrothermal family of organisms best known for vents beneath the Pacific causing human illnesses like tuberOcean near the Galaculosis and leprosy but do not cause pagos Islands off South disease themselves. The Yellowstone America. microbes are the most acid tolerant in the world and extremely rare. They get energy from the dissolved metals and hydrogen found in the hot water.
But the galaxy contains hundreds of billions of sun-like stars. Many of these stars have planets, called exoplanets, in their orbits. By 2010 astronomers had observed 496 known exoplanets with hundreds more awaiting confirmation. Those who study exoplanets believe that some of these worlds might have Earthlike environmen36 tal conditions in which humanlike creatures could evolve. Other exoplanets might host exotic life-forms that consume methane or some biogenic element. Of all the exoplanets, the one that has generated the most excitement is known as Gliese 581g, which was discovered in September 2010.