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. 9. Before a star is born, the matter that will become the star exists as a __ black hole bright, explosive supernova red giant cool, dark nebula

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Cool, dark nebula.

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## Step 1: Before a star is born, the matter that will form the star exists in a certain state. This state is not a black hole, a bright, explosive supernova, or a red giant. These are stages or phenomena that occur later in a star's life cycle. ## Step 2: The matter that will become a star exists as a cool, dark nebula before the star is born. Nebulas are vast clouds of gas and dust in space. They are often referred to as "star nurseries" because the process of star formation takes place within them. ## Step 3: The gravitational forces within the nebula cause the gas and dust to clump together. As the pressure and temperature increase, nuclear fusion begins, and a star is born.

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. 9. Before a star is born, the matter that will become the star exists as a __ black hole bright, explosive supernova red giant cool, dark nebula

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