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Since the invention of radio more than a century ago, man has been broadcasting into space in the hope that any listening aliens could learn of our presence.
Yet, despite waves travelling a distance of 200 light years in all directions, they still have 118,800 light years to go until the entire Milky Way has heard the word.
In the photograph below, the small yellow dot - with the even tinier Planet Earth buried somewhere in its centre - reveals the limited extent of broadcasts since Marconi invented the radio in 1895.
Yet, given that it would take just four minutes to get to Mars when travelling at the speed of light, the distance of 200 light years is no small feat.
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Yet, despite waves travelling a distance of 200 light years in all directions, they still have 118,800 light years to go until the entire Milky Way has heard the word.
In the photograph below, the small yellow dot - with the even tinier Planet Earth buried somewhere in its centre - reveals the limited extent of broadcasts since Marconi invented the radio in 1895.
Yet, given that it would take just four minutes to get to Mars when travelling at the speed of light, the distance of 200 light years is no small feat.
And, given recent evidence of a possible earthquake on the Red Planet that indicate life there, perhaps all we are waiting for is for Martians to invent a radio set.
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