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EzraJupiter and Saturn are both types of planets we call gas giants because they are composed almost entirely of gas. In this case, Jupiter is about 90% hydrogen and about 10% helium with only traces of anything else. Saturn is about 93% hydrogen and about 7% helium with traces of other gas. Wikipedia has the rundown, and links are provided.
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What is the only inner planet with no atmosphere?
Mercury is the only inner planet with no significant atmosphere. Its thin exosphere consists mainly of oxygen, sodium, hydrogen, helium, and potassium.
Why are the outer planets less dense?
They are made of less dense materials. While the inner planets are made primarily of rock, the outer planets are made mostly of hydrogen and helium.
How do the gas planets differ from the inner planets of the solar system?
The terrestrial planets are composed primarily of silicate rocks or metals. They have a solid surface. The gas giants are composed mostly of hydrogen, helium, and water existing in various physical states.
What are the two main gases in the Sun?
The two main gases in the Sun are hydrogen and helium. Hydrogen makes up about 74% of the Sun's mass, while helium makes up about 24%. Other elements like oxygen, carbon, and nitrogen make up the remaining 2%.
What is a terestrial planet?
A terrestrial planet is a rocky planet that is similar in composition to Earth. They typically have solid surfaces, dense metallic cores, and are composed mostly of rock and metal. The inner planets in our solar system, such as Earth, Mars, Venus, and Mercury, are examples of terrestrial planets.
