Question

What are the most abundant atmospheric gases found on the outer planets?

Answer 1

Mainly hydrogen, helium, methane and ammonia in different combinations.

Explanation:

Outer planets Jupiter, Saturn, Uranus and Neptune are gaseous planets.

Jupiter's atmoshere mostly consists of hydrogen, helium, ammonia, and methane, but mostly hydrogen and helium.

Atmosphere of Saturn is similar to Jupiter and contains mostly hydrogen and helium.

Atmosphere of Uranus is made up of hydrogen, helium and methane

and similar is that of Neptune i.e. mostly hydrogen, helium and methane.

Atmosphere of Uranus and Neptune (as the planets are smaller) contain more methane and ammonia then Jupiter and Saturn.

Pluto's atmosphere consists mainly of nitrogen along with minor amounts of methane and carbon monoxide.