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STAR FORMATION" Star formation is the process by which a interstellar cloud of molecular gas and dust becomes a star. The original cloud begins to collapse due to some external disturbance. In the collapse, the cloud gains energy and increases in density. Although at first the energy gained is emitted into space as radiation, there comes a time when the density of the cloud is already so great that prevent radiation leakage. The cloud is heated. By continuing to contract, continue to increase the density and temperature. And dust molecules break into atoms and these into their constituent particles. Although the details are complex, the end of the story is simple: as the temperature increases may start nuclear reactions in the center of what was a molecular cloud, and that has become a star.
NGC 3603, a giant nebula houses one of the most striking massive star clusters in the galaxy, an archetype for studying star formation processes. NGC 3603 is some 20 000 light years from Earth. Credit: NASA, ESA, Jesus Maiz Apellániz (Instituto de Astrofisica de Andalucia) and David Martin.
Glossary: \u200b\u200b"100 basics of Astronomy "
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