What Happens to Cores of Main-Sequence Stars as They Age

question 16

Multiple Choice

What happens to cores of main-sequence stars as they age?

• A) They cool down because they run out of hydrogen fuel.
• B) They cool down because they expand.
• C) They heat up because they contract.
• D) They heat up because helium is more tightly bound than hydrogen.

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Definitions:

Compounded Monthly

An interest calculation method where interest earned is added to the principal balance every month, increasing the amount of future interest accrued.

Compounded Semi-Annually

Interest calculation method where the interest is added to the principal biannually, leading to interest on interest.

Quarterly Compounded

Interest on an investment or loan that is calculated and added to the principal balance four times a year.

Nominal Rate

The advertised or stated interest rate on a loan or investment, not accounting for compounding or inflation.