The First Attempt to Map the Galaxy Via Star Counts

question 81

Multiple Choice

The first attempt to map the Galaxy via star counts was done by:

• A)Galileo in 1612.
• B)William Herschel in the late eighteenth century.
• C)Edward Barnard with long exposure photos about 1900.
• D)Harlow Shapley with the RR Lyrae variables in 1920.
• E)Edwin Hubble with the new 100" Mt. Wilson telescope in the 1930s.

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Definitions:

Allergic Reaction

An immune system response to a foreign substance that is typically not harmful to the body, such as pollen, pet dander, or certain foods.

Market Segments

Divisions within a market that are identified by specific needs and characteristics, allowing for targeted marketing strategies.

Profit

The money left after a for-profit organization subtracts its total expenses from its total revenues and is the reward for the risk it undertakes in marketing its offerings.

ROI

Return on Investment, a financial metric used to measure the efficiency and profitability of an investment.