Pulsars, white dwarfs, neutron star and black holes are the remains of dead stars, quasars are powered by black holes.

When a star less than about 8 solar masses runs out of hydrogen and helium fuel, its core isn't hot enough to start carbon fusion. The core which consists of mainly carbon and oxygen collapses under gravity to form a white dwarf. Gravitational collapse is stopped by electron de... more

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James Vardini
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