What Important Role Do Cepheid Variables Stars Have in Astronomy

question 356

Multiple Choice

What important role do Cepheid variables stars have in astronomy?

• A) distance measurements to distant galaxies
• B) the determination of stellar luminosities
• C) the determination of speeds of stars in galactic arms from the Doppler shift of their spectra
• D) the keeping of accurate time

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Definitions:

Compounded Semi-annually

Calculating and adding interest to the principal twice a year, affecting the overall interest accrued over time.

Compounded Quarterly

The process of calculating interest on both the initial principal and the accumulated interest from previous periods, done four times a year.

Maturity

The date on which the principal amount of a financial instrument is due to be paid back in full.

Non-interest-bearing

Referring to financial instruments or accounts that do not earn interest over time.