Question

Which gas give Neptune it's faint blue colour?

Answer 1

Hey mate....
@Here is ur answer....
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Methane gas give Neptune it's faint blue colour...
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Hope it helps u...
##Banna Sarkar

Answer 2

"Neptune's atmosphere is made up of hydrogen, helium and methane... The methane is Neptune's upper atmosphere absorbs the red light from the sun but reflects the blue light from the Sun back into space.
That's why Neptune appears blue"...

hOpe it hElp$...

:)