An exoplanet is a planet that orbits a star outside our solar system. The Kepler Space Telescope was launched by NASA in 2009. It used the transit method, detecting tiny dips in a star’s brightness when a planet passed in front of it. This method allowed Kepler to confirm over 2,600 exoplanets before its mission ended in 2018...
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Image from NASA, ESA, CSA, J. Olmsted (STScI)