Published on Aug 26, 2012 by Forensic Evidence
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Extraterrestrial life (from the Latin words: extra [“beyond”, or “not of”] and terrestris [“of or belonging to Earth”]) is defined as life that does not originate from Earth. It is often also referred to as alien life, or simply aliens (or space aliens, to differentiate from other definitions of alien or aliens). These hypothetical forms of life range from simple bacteria-like organisms to beings far more complex than humans.
The development and testing of hypotheses on extraterrestrial life is known as exobiology or astrobiology; the term astrobiology, however, includes the study of life on Earth viewed in its astronomical context. Many scientists consider extraterrestrial life to be plausible, but there is no conclusive evidence for its existence. Since the mid-20th century, there has been an ongoing search for signs of extraterrestrial life, from radios used to detect possible extraterrestrial signals, to telescopes used to search for potentially habitable extrasolar planets. It has also played a major role in works of science fiction.
Alien life, such as bacteria, has been hypothesized to exist in the Solar System and throughout the universe. This hypothesis relies on the vast size and consistent physical laws of the observable universe. According to this argument, made by scientists such as Carl Sagan and Stephen Hawking, it would be improbable for life not to exist somewhere other than Earth. This argument is embodied in the Copernican principle, which states that the Earth does not occupy a unique position in the Universe, and the mediocrity principle, which holds that there is nothing special about life on Earth. Life may have emerged independently at many places throughout the Universe. Alternatively life may form less frequently, then spread between habitable planets through panspermia or exogenesis. In any case, complex organic molecules necessary for life may have formed in the protoplanetary disk of dust grains surrounding the Sun before the formation of the Earth based on computer model studies. According to these studies, this same process may also occur around other stars that acquire planets. (Also see Extraterrestrial organic molecules.)
Sound is a mechanical wave that is an oscillation of pressure transmitted through a solid, liquid, or gas, composed of frequencies within the range of hearing and of a level sufficiently strong to be heard, or the sensation stimulated in organs of hearing by such vibrations.
The perception of sound in any organism is limited to a certain range of frequencies. For humans, hearing is normally limited to frequencies between about 20 Hz and 20,000 Hz (20 kHz), although these limits are not definite. The upper limit generally decreases with age. Other species have a different range of hearing. For example, dogs can perceive vibrations higher than 20 kHz, but are deaf to anything below 40 Hz. As a signal perceived by one of the major senses, sound is used by many species for detecting danger, navigation, predation, and communication. Earth’s atmosphere, water, and virtually any physical phenomenon, such as fire, rain, wind, surf, or earthquake, produces (and is characterized by) its unique sounds. Many species, such as frogs, birds, marine and terrestrial mammals, have also developed special organs to produce sound. In some species, these produce song and speech. Furthermore, humans have developed culture and technology (such as music, telephone and radio) that allows them to generate, record, transmit, and broadcast sound. The scientific study of human sound perception is known as psychoacoustics.
Coast to Coast AM covers unusual topics and is full of personal stories related to callers. While program content varies, most nights are focused on paranormal and pseudoscientific subjects such as the occult, remote viewing, hauntings, shadow people, the undead, psychic reading, metaphysics, conspiracy theories, UFOs, Area 51, crop circles, cryptozoology, Bigfoot, the Hollow Earth hypothesis, and science fiction literature, among others. Since the September 11, 2001 attacks, the events of that day (as well as alternate theories surrounding them) and current U.S. counter-terrorism strategy have also become frequent themes. George Noory, the main host since Art Bell retired, also takes interest in the 2012 phenomenon and believes something will happen.
The categories usually discussed are “alternative history”, “alternative medicine”, health, “ancient world”, artwork, comics, multimedia, creatures, myths, legends, “current events”, economy, extraterrestrial, miscellaneous, mysteries, anomalies, nature, environment, “earth changes”, “pop culture”, 2012, prophecy, predictions, psychology, mind, science, space, technology, spirituality, occult, supernatural, paranormal, UFOs, “aerial phenomena”, weird, bizarre and much more.