Saturn. Saturn is the second largest planet in the solar system, with a radius of 60,268 km (9.45 times Earth), and orbits at an average distance of 9.54 AU (1,429,400,000 km) from the Sun, taking 29 years to complete one orbit.
http://astronomy.nmsu.edu/tharriso/ast110/class09.html
Jupiter. Jupiter is the fifth planet from the Sun, and is the largest planet in the solar system. Its average distance from the Sun is 5.2 AU (778,330,000 km), and its equatorial radius is 68,700 km (almost 11 times that of Earth).
http://astronomy.nmsu.edu/tharriso/ast110/class09.html
Neptune Facts. Neptune is the eighth planet from the Sun making it the most distant in the solar system. This gas giant planet may have formed much closer to the Sun in early solar system history before migrating to its present position.
http://space-facts.com/neptune/
Triton Moon Facts Triton is Neptune’s largest moon and is the only large moon in the solar system to orbit in the opposite direction to its planet’s rotation,... Io Moon Facts Io was discovered, along with Europa, Ganymede and Callisto by Galileo Galilei in 1610.
http://space-facts.com/neptune/
Saturn is certainly the most photogenic of all of the planets: It also has storms and features like those seen on Jupiter: The ring system of Saturn is composed of many small boulders, rocks and dust from a disrupted moon.
http://astronomy.nmsu.edu/tharriso/ast110/class09.html
Despite being smaller than Uranus, Neptune has a greater mass. Below its heavy atmosphere, Uranus is made of layers of hydrogen, helium, and methane gases. They enclose a layer of water, ammonia and methane ice. The inner core of the planet is made of rock. Neptune Distance from the Sun. The atmosphere of Neptune is made of hydrogen and helium, with some methane: The methane absorbs red light, which makes the planet appear a lovely blue. High, thin clouds drift in the upper atmosphere.
http://space-facts.com/neptune/
The next four planets we will talk about--Jupiter, Saturn, Uranus, and Neptune--are very different to the terrestrial planets in that they have no real solid surfaces, being dominated by thick, deep atmospheres.
http://astronomy.nmsu.edu/tharriso/ast110/class09.html
Saturn: Due to its distance from the Sun, Saturn is a rather cold gas giant planet, with an average temperature of -178 °Celsius. But because of Saturn’s tilt, the southern and northern hemispheres are heated differently, causing seasonal temperature variation.
http://www.universetoday.com/35664/temperature-of-the-planets/
Neptune: With temperatures dropping to -218°C in Neptune’s upper atmosphere, the planet is one of the coldest in our Solar System. And like all of the gas giants, Neptune has a much hotter core, which is around 7,000°C.
http://www.universetoday.com/35664/temperature-of-the-planets/
While Saturn is massive, equivalent to 95 Earth's, it has the lowest density of all of the planets: 0.71 gm/cm 3, less than that of water! If Saturn was a solid object, and you had a big enough ocean, it would float.
http://astronomy.nmsu.edu/tharriso/ast110/class09.html
which planet is colder saturn or neptune
The planet Saturn is colder. Saturn is a colder planet than Neptune.