There have been over 400 hundred planets discovered orbiting stars, in addition to the ones around our Sun. Several different methods are used. Most of these planets, are much bigger than Jupiter, because it is difficult to detect planets about the size of the Earth or smaller. Also a few of the planets are very close to their stars and have day time temperatures io the thousands of degrees Celsius.
This BBC article talks about one of the methods, which in this case actually images the planets directly - albeit a trifle on the tiny image side...
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