The total amount of matter contained in a star, typically measured in solar masses (the mass of our Sun). Stellar mass is the most fundamental property determining a star's evolution, lifetime, and ultimate fate.
From Latin 'stella' for star and 'massa' meaning lump or bulk. The concept became quantifiable in the early 20th century with the development of stellar physics and the understanding that mass governs stellar structure and evolution.
Stellar mass is the cosmic dictator that controls a star's entire life story! From birth to death, whether a star becomes a white dwarf, neutron star, or black hole is entirely determined by how much mass it was born with.
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