ESA - What are exoplanets? - European Space Agency
https://www.esa.int/Science_Exploration/Space_Science/Exoplanets/What_are_exoplanets
WebAn exoplanet is a planet outside our own Solar System, sometimes referred to as an extrasolar planet. More than 5000 exoplanets have been confirmed. Some are massive, like Jupiter, but orbit much closer to their host star than Mercury does to our Sun. Others are rocky or icy, and many simply do not have analogues in our Solar System. wikipedia
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