4. The Wow Signal
The Wow Signal was a strong narrow-band radio signal detected by Jerry R. Ehman, in 1977. For 72 seconds a signal was detected, so powerful and coming from such a distance that it could only have been delivered by technology far more advanced than our own. The signal was only received once at the time of writing.
Scientists were perplexed but quickly ruled out a raft of suggestions, including radio signals on earth being trapped and amplified by clouds and space radiation leaking through to earth on the back of a meteorite. As eyes turned skywards in the direction of the signal, thoughts inevitably turned towards matters of an extra terrestrial nature.
In 2012, we beamed back 10,000 Twitter messages in the direction that the original signal came from. ET has yet to give any indication that they have received our social media communiqué. Maybe the truth was something as dull and simple as unnaturally strong TV signals; either that, or aliens are as bored of selfies as everybody else is.
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