What Important Role Do Cepheid Variables Stars Have in Astronomy

question 47

Multiple Choice

What important role do Cepheid variables stars have in astronomy?

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

---

Definitions:

Firm-specific Events

Events that directly affect a company's operations, financial performance, or stock price, independent of the market or economic conditions.

Macroeconomic Events

Large-scale economic events that affect the economy on a national or global level, such as inflation, unemployment, or fiscal policies.

Unsystematic Risk

The segment of risk that is unique to a specific company or industry, also known as diversifiable risk, which can be mitigated through diversification.

Diversification

Spreading a portfolio over many investments to avoid excessive exposure to any one source of risk.