Saturn is known for the beautiful rings that form a giant hula hoop around it. The rings are made of chunks of ice and rock. There are seven main rings made up of closely-packed thinner rings. Saturn's Great White Spot, actually a big storm, can be seen every 30 years or so through Saturn's thick cloud layer. Look for the next storm around the year 2020.

Image credits: main image: courtesy of JPL, California Institute of Technology and NASA.