Question

why Neptune planet is blue in colour? Is it has water?

Answer 1

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

Answer 2

Neptune is very far from sun as the Ray's off sun or sunlight ⛅ doesn't reach to it so Neptune is blue in colour,Yes water is also present in Neptune but in frozen form or in glacier form.