Exoplanet - Wikipedia
https://en.wikipedia.org/wiki/Exoplanet
OverviewHistory of detectionDefinitionNomenclatureDetection methodsFormation and evolutionPlanet-hosting starsGeneral featuresFor centuries scientists, philosophers, and science fiction writers suspected that extrasolar planets existed, but there was no way of knowing whether they were real in fact, how common they were, or how similar they might be to the planets of the Solar System. Various detection claims made in the nineteenth century were rejected by astronomers.
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