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en.wikipedia.org/wiki/Gas_giant

A gas giant is a giant planet composed mainly of hydrogen and helium. Jupiter and Saturn are the gas giants of the Solar System. ... are often combined, hydrogen planets need not be as large as the familiar gas giants from the Solar System.

www.qrg.northwestern.edu/projects/vss/docs/space-environment/2-what-are-planets-made-of.html

The other planets are not solid. Jupiter, for instance, is made up mostly of trapped helium, hydrogen, and water. In our solar system, the four "gas giants" are ...

sciencing.com/planets-gas-planets-8392334.html

Apr 25, 2017 ... There are four planets in our solar system that are collectively known as the ... The gas planets are made up almost entirely of gases, primarily ...

www.space.com/30372-gas-giants.html

Aug 25, 2015 ... The solar system's outer planets — Jupiter, Saturn, Uranus and Neptune ... A gas giant is a large planet composed mostly of gases, such as ...

space-facts.com/gas-giants

The four gas giants in our solar system are Jupiter, Saturn, Uranus, and Neptune. ... is a disk made up of dust, chunks of material (ice, in the outer solar system), ...

scienceline.ucsb.edu/getkey.php?key=4401

The planets in our solar system are each made out of different things. ... though earth has a thin atmosphere made up mostly of nitrogen and oxygen gases.

van.physics.illinois.edu/QA/listing.php?id=1110

The Rest of the Solar System. Most recent answer: 10/22/2007. Q: Why are the inner planets are made of rock and free of gas and the outer planets have trapped ...

lasp.colorado.edu/education/outerplanets/solsys_planets.php

It is worth noticing that the eight planets in our solar system make up two ... Why do objects that formed from the same cloud of gas have different compositions? ... Thus, the inner planets are made almost entirely of rock and metal and form the ...

lasp.colorado.edu/education/outerplanets/giantplanets_whatandwhere.php

SUMMARY: The jovian planets are essentially big balls of gas, each ... Made almost entirely of hydrogen and helium, these planets do not have solid surfaces. ... We can trace almost all the differences to the formation of the solar system.