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For low-mass stars, after the helium has fused into carbon, the core collapses again. As the core collapses, the outer layers of the star are expelled. A planetary nebula is formed by the outer layers. The core remains as a white dwarf and eventually cools to become a black dwarf.
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3 North Sea and the English Channel
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sorry if I'm wrong
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<u><em>Soon India will be the largest individual donor to the global demographic change. Demographic wise in 2025 India will do better than China as the world's largest country according to the U.S Census Bureau predicts. This means that India in the next 20 years will be having an economic challenge as the population rises in the future.</em></u>
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