signal

I saw Elon Musk tweet about this awhile back. Looks like Snowden uses it as well. https://signal.org/

https://www.cnn.com/2020/02/11/world/repeating-fast-radio-burst-pattern-scn-trnd/index.html "Mysterious radio signals from space have been known to repeat, but for the first time, researchers have noticed a pattern in a series of bursts coming from a single source half a billion light-years...

Source

http://apod.nasa.gov/apod/ap110206.htmlhttp://apod.nasa.gov/apod/image/1102/unknownseti_cavan_900.jpg

On August 15, 1977, a radio telescope at Ohio State University pointed skyward picked up an unusual signal. The telescope was searching the radio wave spectrum as part of the Search for Extraterrestrial Intelligence, or SETI, program. Four days later, a volunteer with SETI, Professor Jerry Ehman...