Ask Ethan: Could SETI detect an Earth-like civilization?
<p>Someday, if nature is kind to us, we’ll make the grandest discovery of all: that we aren’t alone in the Universe. While various observatories and space missions might someday soon find life on other worlds, our ultimate ambition is even grander: to find another intelligent, technologically advanced civilization out there, to receive and listen to their signals, to send our own human-generated signals their way, and to establish two-way communication. If there’s anyone else out there within a reasonable distance to make contact with, it’s only a matter of time, technology, investment, and luck before our searches pay off.</p>
<p>But how far along on the path towards finding extraterrestrial intelligence are we, really? Could we even detect another civilization that’s operating and broadcast at the level that humans are currently at here on Earth? That’s the question of David Dempster, who asks:</p>
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