Diameter	49,532 km / 30,779 miles
Avg. distance from Sun	4,496,976,000 km / 2,797,770,000 miles
Number of known moons	13
Time taken to turn on axis	16 hours, 7 minutes
Time taken to orbit Sun	164.8 years
Surface gravity	1.21
Temp. at cloud tops	-200 °C / -328 °F

Neptune is the eighth planet in the Solar System, the second planet to be "discovered", the first planet to be discovered without actually being seen and the last of the four "Gas Giants"! Named after the Roman god of the sea, probably because of its deep blue colour, Neptune is also the windiest planet in the Solar System. Its orbit sometimes goes beyond that of Pluto, meaning that for a certain length of time, it is actually the most distant known planet in the Solar System. Orbiting Neptune are at least thirteen moons and a ring system.