Surrounded by an invisible sphere of infinite data, our understanding of the universe depends on signals sent and received. But once in a while a strange phenomenon occurs; a faulty message, or a literal blip on a screen. What are these unknown signals? And what could they mean? In a reality where we feel completely comfortable with our mastery of data - analog or digital - what should we think when what we've seen or heard has no known origin and no clear meaning?

From a suspected cosmonaut's last communication, to a mysterious cry for help over a radio, to an unexplained ghost in the radar weather over Kentucky, to a floating city in the clouds; these tantalizing mysteries come from all corners of the cosmos to alert us to what might really be out there.