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Originally Posted by brassmonkey
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interesting image. if a civilization can produce such effect - a humanoid looking cloud following a planet, this would be the best way to say "Hello World!", letting universe know that you are out there. and then see if any other intelligent and capable form responds with something similar in some future.
it is also good idea if you can use some near by dying star, which definitely will attract attention of any other life form studying cosmos, like we have been doing.