The cosmic tug-of-war that determines a star's ultimate fate
In short: From collapsing dust to explosive supernovas, stars are defined by a constant battle between gravity and nuclear fusion. This video breaks down the life cycles of different stellar masses for students preparing for upcoming physics exams.
A star begins as a nebula where gravity pulls gas and dust together into a protostar. As temperature and pressure rise, nuclear fusion ignites, creating a main sequence star. During this stable phase, the outward pressure from fusion perfectly balances the inward pull of gravity.
The end of a star depends on its initial mass. Small to medium stars eventually become red giants before collapsing into white dwarfs, then cooling into black dwarfs. Conversely, large stars expand into red supergiants and may end in a supernova explosion, leaving behind either a dense neutron star or a black hole if the original star was exceptionally massive.
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Sources
- Summary by Intellect · source: GCSE Physics - Life Cycle of Stars | How Stars are Formed & Destroyed (2027/28 exams)
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