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Exoplanet - Wikipedia
Extrasolar planet - Simple English Wikipedia, the free encyclopedia
List of directly imaged exoplanets - Wikipedia
Extrasolar Planets Encyclopaedia - Wikipedia
Exoplanets - NASA Science
Extrasolar planet | Definition, Detection, Properties, & Facts
What Are Extrasolar Planets? - Universe Today
ESA - What are exoplanets? - European Space Agency
Exoplanets | HubbleSite
Exoplanets: Worlds Beyond Our Solar System - Space.com