Should we build a monument to our civilization before humans go extinct?
Photograph by Maksym Gorpenyuk/Hemera
This is the second half of a two-part article on Earth's legacy and the search for extraterrestrial life. (Read Part 1.)
Somewhere in the cosmos, 36 light years away from us in the direction of the Hercules constellation, a series of electromagnetic waves stretching across 30 million miles of space carries a message from Earth. Each of the 1,679 signals it contains falls in one of two frequencies—an FM signal that translates to a bunch of ones and zeroes.
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