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The Chandrasekhar limiting mass for white dwarfs implies that stars cannot become white dwarfs if their mass is more than about 1.4 solar masses at the ends of their lives. What becomes of stars that have more mass? They are destined to collapse to objects much more dense even than white dwarfs. If the mass is not more than about 3-4 solar masses in the final collapse, the star will become a rather incredible object called a neutron star that packs the mass of a large star into a region the size of a city.

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