(C) The planet Saturn is hotter than Neptune because Neptune is the farthest planet from the Sun, at a distance of about 4.5 billion km. Due to its distance from the Sun, Saturn is a cold gas giant planet, with an average temperature of -178° Celsius. Our Solar System has eight official planets which orbit the Sun.Planets in order of their distance from the Sun are:Mercury, Venus, Earth, Mars,Jupiter, Saturn, Uranus and Neptune.