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Facebook QR Code, Doritos Campaign, More Alien Outreach (PHOTOS)
Alien Outreach
From mirrors to radio messages, check out the different ways humans have tried to message aliens.
Facebook QR
Paul Mayne / Flickr
The Heliotrope
Left: Oil painting of Carl Friedrich Gauss by G. Biermann; Right: NOAA
The Parabolic Mirror
The SETI Signal
Tomas va Houtryve / AP Photo
The NASA Voyagers
NASA / AP Photo
The Beatles Test
NASA / AP Photo
The Doritos Campaign
Roger Eritja / Getty Images
