How Do We Weigh Stars?

How do we figure out how massive a star is if it lives lightyears away from us?

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Mass of Stars (Universe Today)
"Stars can range in mass from the least massive red dwarf stars to the monstrous hypergiant stars. Let's take a look at the mass of stars at various sizes."

New Way to Weigh a Star (Science Daily)
"Researchers have developed a new method for measuring the mass of pulsars - highly magnetized rotating neutron stars formed from the remains of massive stars after they explode into supernovae."