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Explore the 30 most spectacular planets outside our solar system with this flashcard set, exclusively from Astronomy magazine. Learn about the discovery date, type of planet, distance from Earth, radius, mass, orbital period, and more fun facts about 30 exoplanets, including TRAPPIST-1, Kepler-186f, 51 Pegasi b, 55 Cancri e, and more. This set features 30 sturdy, 4″ x 6″ cards, each featuring an exoplanet.