The Observation by Hubble That Demonstrated for the First Time

question 56

Multiple Choice

The observation by Hubble that demonstrated for the first time that the Andromeda "nebula" was at a very large distance from the Sun,and outside our Galaxy,was that

• A) the "nebula" appeared to be rotating night-by-night around a center that was not the center of our Galaxy.
• B) Cepheid variable stars appeared to be very faint in the "nebula."
• C) stars with characteristics similar to those of our Sun appeared to be absent in this "nebula."
• D) globular clusters appeared to be distributed in a halo around the "nebula," a sure sign of a separate galaxy.

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Definitions:

WARP

WARP, or the Weak Axiom of Revealed Preference, is a consistency criterion for consumer choice behavior, suggesting that if a consumer prefers bundle A over bundle B when both are affordable, they should not choose B when A is still affordable.

Bundle

A collection of items or services grouped together as a single package.

Laspeyres Price Index

A price index calculated by taking the ratio of the total cost of purchasing a specified set of goods and services at current prices to the total cost of purchasing the same set of goods and services at base period prices, using base period quantities as weights.

Per Capita Income

The average income earned per person in a given area or country, calculated by dividing the total income by the population size.