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

---

Definitions:

Solitary Time

Periods spent alone, which can be used for reflection, self-discovery, or individual activities without the influence or interruption of others.

Open-Idea Discussions

are conversations or debates that encourage the free flow of thoughts and ideas without immediate judgment or restriction, fostering creativity and innovation.

Hodgkin Disease

A type of lymphoma, which is a cancer originating from lymphocytes, characterized by the presence of Reed-Sternberg cells.

DNA

Deoxyribonucleic acid, a molecule that carries the genetic instructions used in the growth, development, functioning, and reproduction of all known living organisms and many viruses.