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What are the compositions of neptune?


Question asked by: knowitall
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Interesting question with regard the composition of Neptune and its atmosphere.

Here are our current thoughts about a planet we really know very little about:

Neptune's atmosphere we believe to consist primarily of molecular hydrogen - in fact concentration is hig at around 80%.

Next up, as usual, comes the second lightest element that is of course helium 19%.

The significant other is methane, weighing in at around 1.5%. And that's what we believe the composition of Neptune to be!
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