Soviet scientists took a strong interest in SETI during the 1960s and performed a number of searches with omnidirectional antennas in the hope of picking up powerful radio signals. A 400 kilohertz band around the marker frequency was scanned using a single-channel receiver with a bandwidth of 100 hertz. Drake used a radio telescope 26 metres (85 ft) in diameter at Green Bank, West Virginia, to examine the stars Tau Ceti and Epsilon Eridani near the 1.420 gigahertz marker frequency, a region of the radio spectrum dubbed the " water hole" due to its proximity to the hydrogen and hydroxyl radical spectral lines. In 1960, Cornell University astronomer Frank Drake performed the first modern SETI experiment, named " Project Ozma" after the Queen of Oz in L. It proposed frequencies and a set of initial targets. Ī 1959 paper by Philip Morrison and Giuseppe Cocconi first pointed out the possibility of searching the microwave spectrum. Friedman (chief cryptographer of the United States Army), assigned to translate any potential Martian messages. Eberle ( Chief of Naval Operations), with William F.
The program was led by David Peck Todd with the military assistance of Admiral Edward W. At the United States Naval Observatory, a radio receiver was lifted 3 kilometres (1.9 miles) above the ground in a dirigible tuned to a wavelength between 8 and 9 km, using a "radio-camera" developed by Amherst College and Charles Francis Jenkins. In the United States, a "National Radio Silence Day" was promoted during a 36-hour period from August 21–23, with all radios quiet for five minutes on the hour, every hour. On August 21–23, 1924, Mars entered an opposition closer to Earth than at any time in the century before or the next 80 years. In the early 1900s, Guglielmo Marconi, Lord Kelvin and David Peck Todd also stated their belief that radio could be used to contact Martians, with Marconi stating that his stations had also picked up potential Martian signals.
Analysis of Tesla's research has led to a range of explanations including: Tesla simply misunderstood the new technology he was working with, that he may have been observing signals from Marconi's European radio experiments, and even speculation that he could have picked up naturally occurring radio noise caused by a moon of Jupiter ( Io) moving through the magnetosphere of Jupiter. In 1899, while conducting experiments at his Colorado Springs experimental station, he thought he had detected a signal from Mars since an odd repetitive static signal seemed to cut off when Mars set in the night sky. In 1896, Nikola Tesla suggested that an extreme version of his wireless electrical transmission system could be used to contact beings on Mars. There have been many earlier searches for extraterrestrial intelligence within the Solar System. 10.1 Realized interstellar radio message projects.6 Search for extraterrestrial artifacts.
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