* Main Sequence Stars: These stars are fusing hydrogen into helium in their core, which is what provides the energy for their light and heat. This is the longest and most stable stage of a star's life.
* White Dwarfs: These are the remnants of stars that have exhausted their nuclear fuel. They are incredibly dense, composed primarily of carbon and oxygen, and no longer produce energy through fusion.
Essentially, a white dwarf is the "corpse" of a star that has already completed its main sequence phase. They are very different from main sequence stars in terms of their composition, energy production, and size.
