What Causes the Characteristic Blue Color of a Reflection Nebula

question 58

Multiple Choice

What causes the characteristic blue color of a reflection nebula?

• A) electrons dropping between energy levels n = 3 and n = 2 in hydrogen atoms
• B) electrons dropping between energy levels n = 2 and n = 1 in hydrogen atoms
• C) thermal blackbody radiation emitted by the hot gas
• D) scattering of starlight from dust grains in the nebula

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Definitions:

1860 Election

The Presidential election in which Abraham Lincoln was elected as the 16th President of the United States, leading to the secession of Southern states and the eventual outbreak of the Civil War.

Inaugural Address

The speech given by a president or leader during their inauguration ceremony, outlining their vision and goals for their term in office.

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People originating from the southern region of a nation, frequently denoting those hailing from the southern United States.

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The general dissatisfaction and unrest in the Southern United States, traditionally concerning issues like economic policies, racial integration, and federal government intervention.