Exoplanets, i.e. planets that orbit stars beyond our solar system, play a special role in the search for extraterrestrial life. So far, a little more than 4,000 exoplanets are known, however, none has been habitable for human or human-like life. About 96 percent of these exoplanets are significantly larger than Earth and are more of the size of gas giants like Neptune or Jupiter. Still, scientists assume that this percentage does not reflect the real conditions in space, since large planets are much easier to detect than small ones.
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