Solar System: Neptune

"Neptune is one of the eight planets that orbit, or travel around, the sun in the solar system. It is a huge, distant planet that is deep blue in color..."

"Third most massive planet of the solar system and the eighth and outermost planet from the Sun. Because of its great distance from Earth, it cannot be seen with the unaided eye. With a small telescope, it appears as a tiny, faint blue-green disk. It is designated by the symbol ♆..."

"Neptune—the eighth and most distant major planet orbiting our Sun—is dark, cold and whipped by supersonic winds. It was the first planet located through mathematical calculations..."