We Know That the Central Object in a Planetary Nebula

question 29

Multiple Choice

We know that the central object in a planetary nebula has a surface temperature of at least ____ because the nebula contains large amounts of ionized hydrogen.

• A)50 K
• B)100 K
• C)500 K
• D)5,000 K
• E)25,000 K

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Definitions:

Psychological Disorder

A pattern of behavioral or psychological symptoms that impact multiple areas of life and create distress for the person experiencing these symptoms.

Subliminal Message

A signal or message designed to pass below the normal limits of perception, not consciously perceived but able to influence thoughts, feelings, or actions.

Popcorn Sales

The business activity of selling popcorn, often emphasized in contexts like movie theaters or events.

Classical Conditioning

A learning process that occurs when two stimuli are repeatedly paired; a response that is at first elicited only by the second stimulus is eventually elicited by the first stimulus alone.