As a matter of fact, stars are created out of clouds of interstellar dust. Gravity will cause such a cloud to collapse on itself. As the cloud of condensing dust contracts, it heats up. Eventually, the temperature of the center gets to the point where fusion reactions ignite and the star is born.
Astrophysicists still argue about the fine points of the birth of stars. There appears for instance, to be a kind of ‘stuttering’ in which the newborn star misfires like a car on a cold morning and blows large amounts of material back into space. Eventually, however, the star settles down into the steady equilibrium that characterizes the star in its mature life.
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