Recipe for a Single Star
Astronomers do know something about the formation of single stars. They are quite sure, for example, that stars form from giant turbulent clouds of gas and dust floating in interstellar space. These clouds are dense enough that every now and then a chunk of the roiling cloud will begin to collapse under its own gravitational weight. Gravity makes the gas fall inward and as material rains down towards the center of the collapsing cloudlet temperatures and density rise to the point where nuclear fusion begins and a star is born.
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