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The most important factor is the stars mass.
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The life cycle of all stars is pretty similar from birth to late in their life - that's when the rest of their life cycle can vary dramatically. Small and medium-sized stars tend to be the longest-lived stars (our Sun is a typical example), and they end their life by expanding, cooling, and then blowing off their outer shell while their nucleus collapses to a "White Dwarf".
Although life-related terms are sometimes applied to stars, they are nonliving.
Mass and size
The "star life cycle" refers to stars. Earth is not a star.
Nobody "invented" it, the life cycle of stars happens naturally.
In the nebula!
The smaller a star is, the longer its life cycle.
the answer is a protostar
The more the mass the shorter their life cycle (the more quickly they use their fuel)
The most important factor is the stars mass.
Stars are "born", mature, reach old age, then "die".
Astro means star its study of the life cycle of stars
The main sequence.
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The more massive a star is, the less its life time.