The term "exoplanet" means an extrasolar planet, or a planet that orbits a star other than our Sun. Choose the correct statement about exoplanets O Astronomers are planning missions to visit several exoplanets. O Astronomers believe exoplanets are very rare. O Most exoplanets are discovered through indirect methods. O All planet systems are organized with rocky planets close to their star and gas giants farther away from their star.