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Untilthe early1990s,we only know theplanets inourownsolar system.However,at this timeastronomers haveidentified morethan 200extrasolarplanetsoutsideour solar system.Searchthe Earthboth seem tohavesucceededuntil now.Astronomersgenerally believethatbetter technologyis neededtofindsome of the worldas on earth.
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