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How do the luminosities and lifetimes of star depend on their mass?

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How do the luminosities and lifetimes of star depend on their mass?

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Generally, larger stars burn more fuel (more surface area) and release more energy (light) compared to their smaller counterparts. This does not apply to non-main sequence stars.

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Due to the law of hydrostatic equilibrium, a star must be warm on the inside to maintain the pressure so it doesn't collapse.

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How do stars form in the interstellar medium? And, how do stars make energy?

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How do stars form in the interstellar medium? And, how do stars make energy?

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When a shock passes through the interstellar medium, it can compress sections into dense clouds. Eventually, these clouds collapse under their own gravity and enter the free-fall phase which heats up the forming protostar. Eventually, once the protostar becomes hot enough, it can start to undergo nuclear fusion and convert atoms into different elements to sustain itself. Now the protostar is becoming a full-fledged star and will use the energy created in the CNO cycle and tri-alpha process to fuel itself for millennia to come.

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How do astronomers study the gas and dust between the stars called interstellar medium?

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How do astronomers study the gas and dust between the stars called interstellar medium?

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Astronomers look at Bok Globules, nebulae, and Herbig-Haro Objects to learn about a star or protostar.

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Type of stellar jet emitted from developing stars like T-Tauris.

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Emission escaping from star which ionizes surrounding gas. The ionized gas can glow a certain color, giving clues about the star.

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Gas which conceal protostars.

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Young stars, not hot enough for nuclear fusion or to be a main-sequence star. Fluctuates in brightness.

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Opaque (not able to be seen through) cloud of dust. Conceals stars and protostars because it scatters light due to a high amount of dust particles