Why Is It Thought That Quasars Probably Spend Only a Fairly

question 106

Multiple Choice

Why is it thought that quasars probably spend only a fairly short time in their highlyluminous phase?

• A)because there aren't many quasars around today
• B)because there aren't any quasars closer than about a redshift of 1
• C)because all quasars are at about the same epoch, narrowly defined in time
• D)because a black hole could not power a highly luminous quasar for more than a few millionyears
• E)because quasars are known to be the consumers of massive galaxies

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Definitions:

Tetany

A condition characterized by severe muscle cramps and spasms caused by an imbalance in calcium levels or other electrolytes in the body.

Endocrine Glands

Glands of the endocrine system that release hormones directly into the bloodstream to regulate bodily functions.

Kidneys

A pair of organs located in the abdominal cavity, responsible for filtering waste from the blood and producing urine.

Adrenal Medulla

The inner part of the adrenal gland that produces adrenaline and noradrenaline, hormones involved in stress response.