List of interstellar radio messages

This is a list of interstellar radio messages.

There are eleven realized IRM projects:

The Across the Universe message, A Simple Response to an Elemental Message and Hello From Earth are not always considered serious. The first two of them were sent to Polaris, which is 431 light years distant from us and whose planetary system, even if it exists, may not be suited for life, because it is a supergiant star, spectral type F7Ib which is only 70 million years old. In addition, both transmission rates were very high, about 128 kbit/s, for such moderate transmitter power (about 18 kW). The main defect of the "Hello From Earth" is an insufficient scientific and technical justification, since no famous SETI scientist made statements with validation of HFE's design. As it follows from [1]: "After the final message was collected on Monday 24 August 2009, messages were exported as a text file and sent to NASA's Jet Propulsion Laboratory in California, where they were encoded into binary, packaged and tested before transmission", but nobody explained why he hopes that such encoded and packaged text will be understood and conceived by possible extraterrestrials.

Some use the term Active SETI Project, but Alexander Zaitsev, who was a scientific head of composing and transmissions of Cosmic Call 1999 & 2003, and Teen Age Message 2001, and a scientific consultant of A Message From Earth, emphasized that he considers above IRMs as the Messaging to Extra-Terrestrial Intelligence Projects.

These seven messages have targeted stars between 20 and 69 light-years from the Earth. The exception is the Arecibo message, which targeted globular cluster M13, approximately 24,000 light-years away. The first message to reach its destination will be A Message From Earth, which should reach the Gliese 581 planetary system in Libra in 2029.

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