Saturn’s moons Titan and Iapetus, Jupiter’s moon Callisto, Earth’s Moon, and the recently-discovered extrasolar moon Kepler 1625b-i are capable of hosting their own moons (submoons), according to a study published in the Monthly Notices of the Royal Astronomical Society: Letters. An artist’s impression of an extrasolar submoon. Image credit: Sci-News.com. Each of the Solar System’s giant planets has large moons but none of these moons have...
