The Location of the Galactic Center Was First Found by Harlow

question 108

Multiple Choice

The location of the Galactic Center was first found by Harlow Shapley with:

• A)radio emissions from Sagittarius A.
• B)Cepheids of Population I in the spiral arms.
• C)RR Lyrae variables in the globular clusters.
• D)planetary nebulae in the open clusters.
• E)infrared observations of the heat from its accretion disk around the black hole.

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Definitions:

Major Organic Product

The primary product of an organic reaction that is formed in the greatest yield compared to any other products.

Major Product

The primary product of a chemical reaction that is formed in the greatest quantity compared to other products.

Phthalic Acid

An aromatic dicarboxylic acid, with formula C6H4(CO2H)2, it is used as a precursor to other chemicals such as dyes, perfumes, and plastics.

Acid Derivative

A compound obtained by replacing one or more of the hydroxyl groups of an acid with an organic group.