The Density of Interstellar Dust Is Very Low, Yet It

question 74

Multiple Choice

The density of interstellar dust is very low, yet it still blocks starlight because:

• A)it is so cold it absorbs higher energy photons.
• B)there is 100 times more opaque gas than dust present in the ISM.
• C)the dust particles are about the same size as the light waves they absorb.
• D)the dust particles are irregular in shape.
• E)ice particles reflect all light back toward their stars, not toward us.

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Definitions:

Perceptual Expectancy

A readiness to perceive particular stimuli in a certain way, influenced by our beliefs, culture, past experiences, and current expectations.

Top-down Processing

A cognitive process that emphasizes the importance of concepts, ideas, or expectations in interpreting sensory information.

Binocular Cues

Cues for perceiving depth based on both eyes.

Monocular Cues

Visual information that allows for perception of depth and distance using one eye alone, including elements such as texture gradient, interposition, relative size, and linear perspective.