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The Teen Age Message (TAM) was a series of interstellar radio transmissions sent from the Yevpatoria Planetary Radar to six solar-type stars during August–September 2001. TAM was organized by Alexander Zaitsev, Chief Scientist at Russia's Institute of Radio-engineering and Electronics. The message's content and target stars were selected by a group of teens from four Russian cities, who collaborated in person and via the Internet. Each transmission comprised three sections: a sounding, a live theremin concert, and digital data including images and text. TAM was humanity's fourth Active SETI broadcast and the first musical interstellar radio message. ==Overview== Zaitsev's proposal for a musical message – the "First Theremin Concert for Extraterrestrials" – was submitted to the Arecibo Observatory in July 2000. It was rejected amid concerns over the dangers posed by advertising the presence of humanity to unknown and possibly highly advanced civilizations. After another unsuccessful attempt to garner support, the project was backed by the Yevpatoria RT-70 radio telescope with funding from the Education Department of Moscow. Unlike the previous digital-only messages Arecibo-1974 and Cosmic Call 1, TAM had a three-part structure, each containing different forms of information. Such structure was suggested by Alexander Zaitsev, and was intended to make the message easier to detect and interpret.〔(RADIO SIGNALS TO EXTRATERRESTRIALS )〕 The three elements of each transmission were: # A coherent sounding signal with slow Doppler wavelength tuning to imitate transmission from the Sun's center. This signal was transmitted in order to help extraterrestrials detect the TAM and diagnose the radio propagation effect of the interstellar medium.〔 # Analog information recorded on the theremin. This electric musical instrument produces a quasi-sinusoidal signal which is easily extracted from background noise. There were seven musical compositions in the "First Theremin Concert for Extraterrestrials". # Binary digital information similar to the Arecibo message, including the logotype of TAM, written greetings in Russian and English, and artistic drawings. This section and the concert program were composed by teens from different parts of Russia.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Teen Age Message」の詳細全文を読む スポンサード リンク
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