We Interpret the Presence of More AGNs in the Past

question 99

Multiple Choice

We interpret the presence of more AGNs in the past than today to indicate that

• A) there were fewer galaxy-galaxy interactions in the past.
• B) there were more galaxy-galaxy interactions in the past.
• C) supermassive black holes were larger in the past.
• D) today's AGNs are hidden primarily by large amounts of cold gas and dust.
• E) AGNs had bigger central black holes in the past.

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Definitions:

Microscope Head

The microscope head is the upper part of a microscope that contains the ocular lenses or eyepieces through which a specimen is viewed.

Working Distance

The distance between the objective lens of a microscope and the specimen being examined when in focus.

Stage and Light Source

Key components of a microscope that support the specimen and provide necessary illumination for viewing.

Objective and Ocular Lenses

Components of a microscope, where the objective lens is close to the object being observed for magnification, and the ocular lens or eyepiece is what the viewer looks through at the magnified image.