Main sequence
Most stellar life is spent fusing hydrogen in the core.
Expansion follows core changes
Stars can become giants or supergiants when core hydrogen is depleted.
Lower-mass endings
Stars like the Sun eventually shed outer layers and leave white dwarfs.
Massive-star endings
Massive stars can undergo core collapse and leave neutron stars or black holes.
Source trail: NASA: star basics
This page explains scientific concepts for general learning. It does not replace laboratory safety procedures, professional engineering guidance, or individualized medical advice.