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The expanding sphere of Radio signals traveling outward from the earth is often portrayed in TV shows and Hollywood movies to be like a time machine.The further you get from earth,the further back you go in the history of Radio and TV broadcasts...
The earth has an expanding bubble of man-made radio signals expanding outward at the speed of light.These early Radio transmissions were short range experiments that used simple clicks and interrupts to show transmission of information in the 1890s.In 1900, Reginald Fessenden made the first,though incredibly weak,voice transmission over the airwaves.
Originally posted by whatsinaname
radiowaves are a frequency of light so, well if they can travel through space and time they probably know what light is.
i'm not saying the aliens are watching our old tv shows and listening to our old radio broadcasts,although they might be...But advanced aliens would surely be able to at least detect that there are continuous signals and waves beaming out into space from our direction,from our solar system,from earth
Originally posted by ignorant_ape
reply to post by blocula
like any EM raditation - the propogation of radio waves is dictated by the inverse square rule
further - the atmosphere [ in particular the ionoshphere degrades the signal at many frequencies
so the true range at which any terrestrial broadcast will be recievable is far less than the theoretical range