Gas giants do not have enough mass that holds much gravitation force to ensure collapsing into a star. The gravitation pull is not strong enough to cause the fusion of hydrogen atoms. These gas giants, such as Jupiter, therefore, do not become stars.
Answer:
They spin very quickly on their axes.
Explanation:
The gas giants spin very quickly, creating a strong centrifugal force. This strong centrifugal force prevents them from collapsing under gravity.
