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March 17, 2005

How to Talk to Aliens

There are currently various efforts going on around the world to receive signals from alien intelligences. These go by the general name of SETI (Search for Extraterrestrial Intelligence). The basic idea is that sensitive radio telescopes are pointed at likely sources and record any radio signals they receive. These signals are then analysed to see if there is any indication that they might be artificially generated.

Unfortunately, there are many natural sources of radio waves in space, so it may be hard to pick out a message from the background noise. One of the main problems in SETI is the amount of computing power required to analyse the vast amount of data recorded by the radio telescopes. One ingenious solution is the SETI@home project. This involves installing a small program which runs in the background on your computer. When your computer has some idle time, it downloads some data from the Internet and starts analysing it, uploading the results when it has finished. By distributing the work amongst many computers (over five million people have joined the SETI@home project) everything proceeds a lot faster.

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Posted by thinkingmachine at March 17, 2005 07:04 PM

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