The World Is Not What it Appears to Be

The world is becoming more and more irrational, more and more fought with anomaly. Not only flying saucers, but Bigfoot and the crop circles. There will be more and more of this stuff, as we approach the moment of concrescence. And to the degree that one can clear themselves of the momentum of past presupposition, the transcendental object at the end of time actually comes into view. Plato said 'time is the moving image of eternity'.

The Search for Extraterrestrial Life - Terence McKenna

A radio telescope is a form of directional radio antenna used in radio astronomy. The same types of antennas are also used in tracking and collecting data from satellites and space probes. In their astronomical role they differ from optical telescopes in that they operate in the radio frequency portion of the electromagnetic spectrum where they can detect and collect data on radio sources. Radio telescopes are typically large parabolic ("dish") antennas used singly or in an array. Radio observatories are preferentially located far from major centers of population to avoid electromagnetic interference (EMI) from radio, TV, radar, and other EMI emitting devices. This is similar to the locating of optical telescopes to avoid light pollution, with the difference being that radio observatories are often placed in valleys to further shield them from EMI as opposed to clear air mountain tops for optical observatories.