7 Ways We Might Finally Prove Aliens Exist

7. Radio Signals

This is the one we've been rooting for for quite some time now. Thanks to the plethora of radio telescopes around the world, the Earth currently has literally hundreds of ears pointed at the heavens, listening out for, amongst other things, signals from ET.

There have been a fair few flurries of excitement in this department so far, from the Wow! signal (which is now thought to be the result of a passing comet) to the LGM signal (which turned out to be a pulsar).

Particularly mysterious at the moment are a type of radio signal known as FRBs, or Fast Radio Bursts. These are extremely fast, extremely energetic bursts of radio waves that appear to be originating from outside the galaxy. At least five of the sources of FRBs appear to be evenly spaced from the Earth and ten of them have dispersions that are all multiples of the same number (187.5), not exactly conclusive, but certainly a bit odd. They're originating about 3 billion light years away, and we so far have no idea what is causing them.

Although there was an incident back in 2010 when scientists discovered that the origin of one of their signals was, in fact, a microwave oven in the breakroom. Oops. As well as scanning the skies for radio signals, we have been blasting out our own for nearly a century, one way or another, and we're just hoping that the aliens are looking for them too.