Editing Stellar Evolution (section)

== <span style="color: #FFFFFF;">Remembering</span> ==
* '''Star''' — A luminous ball of gas, mostly hydrogen and helium, held together by its own gravity.
* '''Nuclear Fusion''' — The process where two light atomic nuclei combine to form a heavier nucleus, releasing energy (the power source of stars).
* '''Main Sequence''' — The longest stage of a star's life, where it fuses hydrogen into helium (e.g., our Sun).
* '''Nebula''' — A giant cloud of dust and gas in space; the "birthplace" of stars.
* '''Protostar''' — A very young star that is still gathering mass from its parent nebula.
* '''Red Giant''' — A large, cool star in a late stage of evolution that has exhausted its hydrogen fuel.
* '''White Dwarf''' — The small, dense core left behind after a low-mass star (like the Sun) sheds its outer layers.
* '''Supernova''' — A massive explosion that occurs at the end of a high-mass star's life.
* '''Neutron Star''' — An incredibly dense core left behind after a supernova, composed almost entirely of neutrons.
* '''Pulsar''' — A highly magnetized, rotating neutron star that emits beams of electromagnetic radiation.
* '''Black Hole''' — An object with gravity so strong that not even light can escape; formed from the collapse of the most massive stars.
* '''Luminosity''' — The total amount of energy emitted by a star per second.
* '''Hertzsprung-Russell (H-R) Diagram''' — A graph showing the relationship between a star's luminosity and its temperature.
* '''Hydrostatic Equilibrium''' — The balance between the outward pressure of fusion and the inward pull of gravity.
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