I'll just impose a warning before this thread is ruined. Jacob and Sligface: be quiet.
Lampion, I heard of an interesting way to detect planets the other day on some television program. They look at a distant star and see if it's wobbling. A wobble is an indication of another planet's gravitational pull effecting the star on which it orbits. It must be a rather large planet to have such influence on a star, but then again, I don't profess to know much about astronomy so perhaps the smallest of planets could create a wobble.
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