How Is the Length of a Star's Lifetime Related to the Mass

question 246

Multiple Choice

How is the length of a star's lifetime related to the mass of the star?

• A) Lower-mass stars run through their lives faster and have shorter lifetimes.
• B) The lifetimes of stars are too long to measure, so it is not known how (or if) their lifetimes depend on mass.
• C) A star's lifetime does not depend on its mass.
• D) Higher-mass stars run through their lives faster and have shorter lifetimes.

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Definitions:

Nephrons

The basic structural and functional units of the kidney, responsible for filtering blood and creating urine.

Kidney

An organ in vertebrates responsible for filtering waste products from the blood and excreting them in urine, as well as maintaining electrolyte balance.

Ureter

A tube that carries urine from the kidney to the bladder.

Urine

A liquid by-product of metabolism in humans and many animals, excreted by the kidneys and consisting of water, salts, urea, and other waste substances.