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Fusion: Hydrogen into helium.
Equilibrium: Gravitational pressure = outward radiation.
Timeline: Main sequence stars only change when the fuel runs out and they begin their dying stages.

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92% Hydrogen
7% Helium
1% Heavier Elements

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Online 3D simulation of the Solar System and night sky in real time - the Sun, planets, dwarf planets, comets, stars and constellations

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Respond with what you learned from the lesson here. 

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Respond with what you learned from the lesson here. 

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If the main sequence is a stage for stars, then does that mean all stars go through it?

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If the main sequence is a stage for stars, then does that mean all stars go through it?

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Additionally, what stages will a star go through before and after the main sequence?

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Additionally, what stages will a star go through before and after the main sequence?