Unlike other planets, Neptune does not really have a solid surface; it is made up of gases while its interior is made up of a rocky core, which is very hot. Neptune is quite unique since it glows even without sunlight. M... More »

Fire is not a form of matter; it is a chemical reaction. Fire is not made of any actual materials, but instead it is the result of chemical reactions from heating certain materials while they are in contact with oxygen. More »

Atoms that typically form covalent bonds with each other have similar electronegativity, which expresses the atom's tendency to attract electrons, such as with carbon and hydrogen, which form methane. They stand in contr... More »

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, i... More »

www.reference.com Science Astronomy Planets

The hottest Neptune ever gets at its surface, which is defined as the point at which its thick atmosphere is at the same pressure as the Earth's atmosphere at sea level, is -296 F. These temperatures are found at the pol... More »

The inner planets, Mercury, Venus, Earth and Mars, are made up of silicate rock and heavy metals such as iron and nickel, whereas the outer planets, Jupiter, Saturn, Uranus and Neptune, are made up mostly of gases, accor... More »

Neptune has no identifiable surface layer, and the icy, gaseous atmosphere eventually transitions to a slushy water and liquid ammonia ocean with a rocky, iron core at the center. As the depth increases, the intense pres... More »

www.reference.com Science Astronomy Planets