MARK GARLICK / SCIENCE PHOTO LIBRARY MARK GARLICK / SCIENCE PHOTO LIBRARY
Starbirth. Artwork showing a star during the last stages of its formation. Stars form from clouds of gas that collapse due to gravitational attraction until the star's core is hot and dense enough for nuclear reactions to begin. The energy from these reactions balances the collapse and the new solar wind blows away most of the remaining material. Denser material may remain in the accretion disc after the star is born and accrete over time to form a planetary system.
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