[Answer] 2. How long is a star's life-cycle?

Step 1 : Introduction to the question "2. How long is a star's life-cycle?"

...1. Fifty-one trillion years 2. It depends on the size of the star 3. Thirty-four million years 4. Seventy-eight billion years A star's life-cycle depends greatly on the actual size of the star itself. For example, small stars like red dwarves have lifespans measuring many billions of years while massive stars like super red giants only live for a few million years. Basically, the bigger the star is, the shorter its lifespan.

Step 2 : Answer to the question "2. How long is a star's life-cycle?"

It depends on the size of the star:

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