A new technique for filtering out Earth's radio interference might be the biggest step in the search for extraterrestrial life in decades.
, has never been repeated, and its source is still a subject of intense debate.
The way the new technique works is by looking for scintillation — a repeated brightening and dimming of the signal's amplitude — in the radio signals hitting our radio telescopes. The important leap that Siemion and his colleagues made however is that these scintillations would also affect the very narrow-band radio signals that SETI has been looking for since the 1960s. Since these scintillating signals are definitionally coming from interstellar space and beyond, these scintillations could be the key to algorithmically filtering out human-produced radio interference on Earth , revealing only those signals that don't originate on Earth.
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