Why Do All Stars Spend Most of Their Lives on the Main

question 26

Multiple Choice

Why do all stars spend most of their lives on the main sequence?

• A) because the neutrinos created inside the Sun do not carry any energy away with them
• B) because during this stage the star contracts from enormous size to a relatively small ball; this takes a long time
• C) because the fuel for energy production in this stage of the star's life is hydrogen; and that is an element every star has lots and lots of
• D) because in this stage, the processes inside the star do not generate any energy; thus the star can continue in this stage indefinitely
• E) this is an unsolved problem in astronomy, and is an important project for the world's largest telescopes to work on

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