The Identification of "Spiral Nebulae" as Large Groupings of Stars

question 52

Multiple Choice

The identification of "spiral nebulae" as large groupings of stars outside of our own galaxy was proven by ____.

• A) photographic plates made by Edwin Hubble showing stars and Cepheid variables
• B) the results of the Shapley-Curtis debate
• C) Immanual Kant's "island universe" theory
• D) William Parsons' observation and description of their spiral structure
• E) Harlow Shapley's observations of their radio spectrum

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Definitions:

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Internet Enticement

The act of using the internet to lure or seduce someone into an illegal act, often pertaining to sexual offenses against minors.

Undercover

Operation or activity in which someone secretly gathers information or carries out tasks, often by assuming a false identity.

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The act of being taken into police custody, often as part of the criminal justice process due to suspicion of having committed a crime.