Although humans had explored the stars for many years by the time telescopes came to use, as their use spread, astronomers could see more stars than ever before. The invention — which can be.. Stars form in large clouds of gas and dust called molecular clouds. Molecular clouds range from 1,000 to 10 million times the mass of the Sun and can span as much as hundreds of light-years. Molecular clouds are cold which causes gas to clump, creating high-density pockets. Some of these clumps can collide with each other or collect more matter.

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What Stars Are Made Of provides both an accessible introduction to and an expansive context for the life and work of Cecilia Payne-Gaposchkin, one of the most brilliant astrophysicists of the twentieth century. The sharing of stories like Payne-Gaposchkin's will reshape the future of science so that all aspiring scientists may reach their full potential as we continue to explore the universe.. A star is born. The life cycle of a star spans billions of years. As a general rule, the more massive the star, the shorter its life span. Birth takes place inside hydrogen-based dust clouds.