Stars

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Birth of Star
Main sequence lifetime
Low mass v High mass#160;
Massive clouds of dust and hydrogen produce stars and planets. Gravity is pulling them together.
Red Giant v Supergiant
When all of this pushing of gases and dust from gravity causes heat in the central core, low mass stars like the sun form. At these temperatures, nuclear fusion occurs, and hydrogen transforms into a helium nucleus, which generates energy.
Planetary Nebula Supernova
Because hydrogen feeds low mass stars, they use up their hydrogen slowly and so live a long time. High-mass stars burn through their hydrogen quickly, and their lives are short.
White Dwarf Neutron star or black hole
When all of the hydrogen in the core has been used up, gravity causes the core to collapse and emit heat. This heat induces nuclear fusion on the surface, releasing a large amount of energy and heat, turning it into a red giant. Supergiants are similar to giants, but on a larger size.
A planetary nebula is generated when a red giant ejects its outer atmosphere from a low mass star. The tremendous mass of high-mass stars forces the core to collapse, resulting in a supernova explosion.
Only the core, which is a hot white dwarf planet, remains after a planetary nebula. A black hole is formed when the centre of a supernova becomes unstable and gravity closes in on itself. Alternatively, when the core collapses, enormous pressures crush protons and electrons, creating a neutron star.

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