Hydrogen molecules can form on earth but do not exist as a star explode because because it's a very low density gas.
- A molecule of hydrogen is made up of two hydrogen atoms. A molecule of hydrogen has two protons as well as two electrons which are being held by electrostatic forces.
- It should be noted that when hydrogen molecules in the atmosphere reach the top, the cosmic rays energizes them which leads to the fast movement which enables them to escape from the Earth's gravity. This is the reason for the significant percentage of the hydrogen gas that we've in the atmosphere.
- On the other hand, the gravitational pull is stronger for the gas giants. Also, they are colder than Earth, therefore the hydrogen molecules will be less energetic in such condition. Therefore, hydrogen molecules do not usually exist as a star explode.
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