On last count, there were nine planets in our solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. Soon, however, we might need to add a tenth planet to the solar lineup. Learn more on this Moment of Science.
Unlike Saturn, which has actual, physical rings, the ring you can sometimes see around the moon is merely an optical illusion.
Ever wondered what makes up Saturn's rings? Find out on this Moment of Science.