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Exoplanets are planets that orbit stars outside our solar system. They vary widely in size, composition, and distance from their parent stars.
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Transit Method: A technique for detecting exoplanets by measuring the dimming of a star as a planet passes in front of it.
Radial Velocity Method: A technique for finding exoplanets by observing Doppler shifts in the spectrum of the planet's parent star.
Habitable Zone: The region around a star where conditions may be just right for liquid water to exist on a planet's surface.