Question

1 where do stars get their energy?
gravitation
nuclear fusion
friction from the shrinking nebula
burning of gas and dust within the star
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Explanation:

Stars generate energy through nuclear fusion reactions in their cores, where hydrogen atoms combine to form helium, releasing a vast amount of energy. Gravitation is a force that holds stars together but is not the source of their energy production. Friction from a shrinking nebula is involved in star - formation but not the long - term energy source. Stars do not burn gas and dust in the traditional chemical sense.

Answer:

Nuclear fusion