Mercury is the smallest and innermost planet in the Solar System. Its orbit period around the Sun of 88 days. that makes its the shortest of all the planets in the Solar System.
Earth, otherwise known as the World or the Globe, is the third planet from the Sun and the only object in the Universe . It is also the densest planet in the Solar System and the largest of the four terrestrial planets.
Saturn is the sixth planet from the Sun and the second-largest in the Solar System, after Jupiter. It is a gas giant with an average radius about nine times that of Earth
Uranus is the seventh planet from the Sun. It has the third-largest planetary radius and fourth largest planet mass in the Solar System.
Neptune is very similar to Uranus. It's made of a thick soup of water, ammonia, and methane over an Earth-sized solid center. Its atmosphere is made of hydrogen, helium, and methane. The methane gives Neptune the same blue color as Uranus.