One of the Most Important Features That Must Be Explained

question 46

Multiple Choice

One of the most important features that must be explained by models during the formation of the galaxy is the ____.

• A) formation of spiral arms
• B) differences in age and metallicity of stars, especially in the halo
• C) formation of the central supermassive black hole
• D) accumulation of dark matter in the corona
• E) importance of spiral arms to star formation

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Definitions:

Interposition

A visual cue in which one object partially blocks another, suggesting depth perception.

Sensory Interaction

The principle that one sense can influence or interact with another; the interaction of the senses to enhance the perception of the world.

Moon Illusion

A perceptual phenomenon in which the Moon appears larger near the horizon than it does higher up in the sky.

Horizon

The line where the earth's surface and the sky appear to meet, often used metaphorically to denote the limit of a person's knowledge, experience, or interest.