Why Are Quasars Rare Today

question 46

Multiple Choice

Why are quasars rare today?

• A) The Universe's expansion has spread out the quasars.
• B) The black holes are too massive to be classified as quasars.
• C) There is so much dust today that it obscures quasar emission.
• D) Little gas is left to accrete onto supermassive black holes.

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Definitions:

Dopamine

A neurotransmitter involved in controlling movement and posture, moderating mood, and affecting motivation and reward.

Impulsivity

A tendency to act on a whim, displaying behavior characterized by little or no forethought, reflection, or consideration of the consequences.

Novelty Seeking

The trait of pursuing new and different experiences, sensations, and objects, often driven by a desire for excitement and exploration.

Reward Salience

refers to the significance or attractiveness of a reward to an individual, influencing motivation and behavior.