After the core get fused
..., the only thing fusing is the outskirts of the core. Now these hydrogen particles are like "We don't have any core to stick to, where do we go?". So they start repelling each other. Now, as we know, fusion gives radiation. As the star starts to cool down (as more of its mass gets fused), it starts to get bigger because the radiation from the fusion is pushing the outer particles of this star outwards. The outer layer of this star starts radiating outwards because the gravity of this star can't hold it anymore. This colorful outer layer is planetary nebulae. This phase is called red giant.
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Dark matter, theory of relativity, dark energy, negative mass, end of the universe, The Big Bang, 'What is beyond the universe?' etc. If you love such things, Welcome to your home.'
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