The Observation by Hubble That Demonstrated for the First Time

question 49

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 the Milky Way Galaxy was that

• A) Cepheid variable stars appeared to be very faint in the "nebula."
• B) the "nebula" appeared to be rotating night by night around a center that was not the center of the Milky Way.
• C) stars with characteristics similar to those of the Sun appeared to be absent in the "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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