Neptune

Neptune is 3.9 times bigger. Now mass. The mass of Neptune is 1.02 x 1026 kg. If you wanted to write it out, it would be 102,000,000,000,000,000,000,000,000 kg. Neptune has 17 times as much mass compared to the Earth.

Neptune is the 4th largest planet in the Solar System, after Jupiter, Saturn, and Uranus. It's much larger than the terrestrial planets: Mercury, Venus, Earth and Mars. The diameter of Neptune is 49,500 km.

Neptune revolves or orbits around the sun once every 164.79 Earth years, or once every 60,190 Earth days. Neptune travels at an average speed of 12,253 miles per hour or 19,720 kilometers per hour in its orbit around the sun.

15 hours, 57 minutes

Atmospheric composition: Neptune's atmosphere is composed up of many gases. These gases include Hydrogen (80%), Helium (19%), and Methane (1.5%). Some of the minor gases include trace amounts of Hydrogen Deuteride and Ethane.

-218 degrees Celsius

Neptune is the coldest planet in the Solar System, maintaining a fairly consistent average of -200 degrees Celsius. Towards the planet's equator, temperatures can get as cold as -218 degrees Celsius, while temperature at the South Pole is about 10 degrees Celsius warmer.

the best image of Neptune was this one

Neptune has 14,moon which are triton,s/2004 N1,

Neptune has 14,moon which are triton,s/2004 N1,

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Public - 9/27/16, 6:17 PM