What Is a Cepheid Variable

question 26

Multiple Choice

What is a Cepheid variable?

• A)a bright source of variable X- ray emission, thought to harbor a supermassive black hole
• B)a main- sequence star of spectral type B5
• C)a type of galaxy that varies in its light output
• D)a type of very luminous star that makes an excellent standard candle

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Definitions:

Market System

(1) An economic system in which individuals own most economic resources and in which markets and prices serve as the dominant coordinating mechanism used to allocate those resources; capitalism. Compare with command system. (2) All the product and resource markets of a market economy and the relationships among them.

Incentives

Rewards or penalties designed to influence the actions or behaviors of individuals or entities in desired ways.

Internal Efficiency

The effective allocation and use of resources within an organization or system, leading to the achievement of its objectives without waste.

Public Sector

The segment of the economy comprised of government services and enterprises, funded and operated by the government, serving the public interest.