Most of the universe has no way of knowing that we exist

This article originally appeared on Business Insider.

Most of the aliens probably have no way of knowing that humans are on Earth.
This is a comforting thought if extraterrestrials terrify you and a disappointing one if you can’t wait to find ET. It also suggests just how little we know of the vast universe — and how little it knows of us.

Seth Shostak, director of the Search for Extraterrestrial Intelligence Institute (SETI), told Tech Insider that he (and many other researchers) defines intelligent life as a being who can build a radio.

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