Early Stage:
* Main Sequence: Stars spend the majority of their lives in this stage, fusing hydrogen into helium in their core. They remain relatively stable in size.
Later Stages:
* Red Giant: As a star runs out of hydrogen fuel, it starts fusing heavier elements like helium. This causes the star to expand significantly, becoming a red giant. This is a bigger stage.
* White Dwarf: After exhausting its fuel, a low-mass star sheds its outer layers, leaving behind a dense core called a white dwarf. White dwarfs are smaller than the original star, about the size of Earth.
* Supergiant: More massive stars expand even further, becoming supergiants. This is a bigger stage than the red giant.
* Neutron Star or Black Hole: Massive stars explode as supernovae. The remnants can become either neutron stars (incredibly dense, small objects) or black holes (with immense gravity, where not even light can escape). These are much smaller than the original star.
So, the short answer:
* Stars get bigger during the red giant and supergiant stages.
* They get smaller during the white dwarf and neutron star/black hole stages.
It's a complex process, and the specifics depend on the star's mass.
