Since the first binary code sent from Puerto Rico in 1974, our messages to aliens have been increasingly complicated and cryptic, possibly so much that extraterrestrials won’t get what we’re saying.
A trio of astrophysicists from the US and France hope to change that by building an extraterrestrial messaging protocol, so any spacebound communiqué could be easily understood.
A METI protocol — messaging to extraterrestrial intelligence — would include several factors, including signal encoding, message length and message content, according to Dimitra Atri, an astronomer at the University of Kansas, and his colleagues. They suggest using two specific wavelengths for transmission: 1.42 GHz or 4.46 GHz, which are commonly observed in nature and relatively easy to capture, in case the ETs only have “modest technical capabilities.” They also recommend establishing a dedicated transmission beacon to conduct regular broadcasts.
More information here.
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