A Star Less Massive Than the Sun Will Have

question 90

Multiple Choice

A star less massive than the Sun will have

• A) an identical lifetime as the Sun because although its overall mass is lower, the mass of its nuclear burning core is the same
• B) a shorter lifetime because it has less fuel to burn
• C) a longer lifetime because although its overall mass is lower, the mass of its nuclear burning core is larger
• D) a longer lifetime because its central core is cooler and less dense

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Definitions:

SCN

Stands for the Suprachiasmatic Nucleus, a small region in the brain that regulates the circadian rhythms, including sleep-wake cycles.

Pineal Gland

A small endocrine gland in the vertebrate brain that produces the hormone melatonin, involved in regulating sleep patterns.

Melatonin

A hormone produced by the pineal gland that regulates sleep and wakefulness cycles.

Hypnagogic Sensations

Experiences occurring at the onset of sleep, often involving visual, auditory, or tactile hallucinations.