Why the outer planet's state is gaseous?


Outer planets like Jupiter and Saturn are well known as gas giants as both the planet is composed mainly of hydrogen and helium.

While Uranus and Neptune are now often classified in the separate category of ice giants as both the planet is composed mainly of heavier volatile substances (referred to as "ices")

The temperature of the early solar system explains why the inner planets have a rocky state and the outer ones have a gaseous state. In the inner solar system, temperatures were as high as 2000 K, whereas in the outer solar system it was as cool as 50 K.

Thus, in the inner solar system, only substances with very high melting points remained solid, and all the rest have vaporized. Therefore, the inner solar system objects are made of iron, silicon, magnesium, sulfur, aluminum, calcium, and nickel.

Whereas the region of the outer solar system is much cooler, that's why other elements like water and methane do not vaporize and were able to form the giant planets. 

Also, the inner planets are much smaller than the outer planets and because of this, they have relatively low gravity. As a result, they are not able to attract large amounts of gas to their atmospheres.

Whereas the outer planets are more massive than the inner planets and are able to attract large amounts of hydrogen and helium, that's why they are composed mainly of hydrogen and helium, the most abundant elements in the solar system, and in the universe. 

These are the reason due to which outer planets like Jupiter and Satun are in the gaseous state.

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Updated on: 10-Oct-2022

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