What is the Arecibo Message? - Universe Today universetoday storybywill
, this experiment listened to two nearby Sun-like – Tau Ceti and Epsilon Eridani – for radio signals in the 1420 MHz range, which corresponds to the frequency of cold hydrogen gas in interstellar space. While the project failed to detect anything beyond radio static, Ozma paved the way for far more ambitious SETI efforts.
as a dual-use radio telescope. On the one hand, it was meant to detect incoming ballistic missiles as they traveled through the ionosphere while also studying Earth’s ionosphere.National Astronomy and Ionosphere Center In 1961, a year after Project Ozma, Drake arranged a summit at the Green Bank facility, where the subject of extraterrestrial intelligence and SETI was discussed for the first time. In preparation, Drake formulated an equation that summarized the challenges of communicating with ETI that would come to bear his name – the
The Arecibo radio telescope in Puerto Rico and the Arecibo Message . Credit: Seth Shostak/SETI Institute/APIn the early 1970s, Frank Drake organized the first campaign to compose a message destined for space. The effort would utilize Arecibo’s megawatt transmitter attached to its 305-meter antenna. The resulting emission was equivalent to a 20-gigawatt omnidirectional broadcast, meaning that it would be detectable any radio antenna in the galaxy .
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