The main elements of gas planets are hydrogen and helium.Since there is no flat surface on them, you cannot walk on them. Winds on a gas planet may reach speeds of hundreds of miles per hour, creating a very chaotic environment.
With temperatures approaching millions of degrees Fahrenheit, a gas planet’s interior is likewise extremely hot.
They are considered planets because they meet the three criteria that are used to define planet:
They orbit a star.
They have enough mass for their own gravity to clear the neighbourhood around their orbit.
They are not a star.
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