49,530km in diameter
It has 13 moons
Atmosphere hydrogen, helium,and methane
100 planet facts.com
Neptunes mass compared to earth.
102,000,000,000,000,000,000,000,000 kg. Neptune has 17 times as much mass compared to the Earth
Time to orbit the sun 165 years
It takes 16 hours' 7 min
gases include Hydrogen (80%), Helium (19%), and Methane (1.5%). Some of the minor gases include trace amounts of Hydrogen Deuteride and Ethane.
I picked this planet because, i was reading a book before
I started and it was about poseidon
And its his roman name so i picked it.
only one spacecraft visited neptune
In the summer of 1989
Triton is the biggest moon of neptune
The upper atmosphere I a thick cloud
Neptune has rings
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Public - 9/27/16, 6:53 PM