Space.com indicates that Neptune's diameter of 15,299 miles is fourth longest among the planets. At 102 trillion trillion kilograms, Neptune has the third-highest mass of the eight planets in the solar system. However, it was one of the last planets discovered because it is the farthest from the sun.
Cool Cosmos notes that Neptune's volume is 57.7 times that of Earth. Neptune has a large surface area of 2.9 billion square miles, though it consists of water and ice rather than solid ground. Because of its gas atmosphere and liquid surface, Neptune has a modest density of 1.638 grams per cubic centimeter.Learn More
Neptune is a gas giant and an outer planet. In the solar system, the three other gas giants are Uranus, Jupiter and Saturn. Gas giants are massive planets that have a composition of mainly gases.Full Answer >
The number of moons is constantly changing for some planets as they are discovered, but at the last official count there are 166 moons, with more than 20 waiting to be recognized as moons. This count is only of the moons that orbit recognized planets in the solar system. There are numerous other satellites, like asteroids, that have what would be considered moons circling them as well.Full Answer >
Jupiter is a gas giant composed almost entirely of hydrogen and helium in various forms, with trace elements taking up only 1 percent of the planet's composition. Although it is small compared to the sun, Jupiter is over twice as heavy as all other planets in the solar system combined.Full Answer >
From largest to smallest, a list of the planets ranked by size is Jupiter, Saturn, Uranus, Neptune, Earth, Venus, Mars and Mercury. The size of the planets can be compared by calculating the radius, diameter, circumference or volume.Full Answer >