Neptune.

Neptune is the eighth and farthest known planet from the Sun in the Solar System. In the Solar System, it is the fourth-largest planet by diameter, the third-most-massive planet, and the densest giant planet.

Neptune's mass.

1.024 × 10^26 kg

17.15 M⊕ Its a big number if you where to write it in number form it will be 102,000,000,000,000,000,000,000,000 kg.

Mass of Neptune and how it compares to earth.

To really understand how big Neptune really is, you need some kind of comparison. Let’s see how Neptune compares to Earth in every way.

First, let’s just look at pure size. The diameter of Neptune is approximately 49,500 km. This makes Neptune the 4th largest planet in the Solar System. And compared to Earth? Neptune is 3.9 times bigger.

Size of Neptune and how it compares to earth.

Size of Neptune is 15,299 miles (24,622 km) The diameter of Neptune is approximately 49,500 km. This makes Neptune the 4th largest planet in the Solar System. ... 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

How long  does it take for neptune to orbit the sun.

164.79

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.

Neptune's atmosphere.

The atmosphere of Neptune is similar to all the large planets in the Solar System; it mostly consists of hydrogen and helium, with trace amounts of methane, water, ammonia and other ices. But unlike the other gas planets in the Solar System, Neptune’s atmosphere has a larger proportion of the ices.

My Sources

The sources I used where solarsytemnasa.gov. and spacetoday.com 

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Public - 9/28/16, 7:03 PM