Monday, 16 January 2012

What have we already said to aliens?

Pioneer message plaque

Pioneer probes launched in 1970s depict location of the Earth and the human form (pictured above)

Arecibo message, sent to a distant star cluster in 1974, included information about DNA

Giant radio telescopes send messages to a nearby planetary system around red dwarf star Gliese 581

Earth's television broadcasts could also be picked up by aliens

I Love Lucy signals are more than 50 light years away, and our nearest stars have already received Simpsons broadcasts

The earliest we'll hear back from any beamed messages is 2049