Space isn’t a perfect vacuum, some areas have hydrogen which is a little denser than the rest of space known as nebulas these clouds get even denser to form stars https://youtu.be/w5sFxCo9Nyw basically it all comes down to gravity as the hydrogen gets denser the mass of hydrogen pulls even more atoms towards it until it stars to become a star. https://youtu.be/vVE0B6g9F_0
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