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: There are several thousand known [[exoplanet]]s but they cannot be seen directly and can only be detected by their effect on the [[star]]s they [[orbit]].
===Extra Information=Beyond the Curriculum==
{{#ev:youtube|https://www.youtube.com/watch?v=EUU0-ZpFoK4}}
{{#ev:youtube|https://www.youtube.com/watch?v=AnX7ExBjrHw}}