Which of the Following Statements About Rich Clusters of Galaxies

question 3

Multiple Choice

Which of the following statements about rich clusters of galaxies (those with thousands of galaxies) is not true?

• A)They are sources of X-ray emission due to the presence of hot,intergalactic gas.
• B)There likely have been numerous collisions among the member galaxies at some time in the past.
• C)Galaxies in the central regions are predominantly spirals,while elliptical galaxies roam the outskirts.
• D)They often have a very large,central dominant galaxy near their center,perhaps formed by the merger of several individual galaxies.
• E)The speeds of the galaxies in the cluster indicate that most of the cluster mass is dark matter.

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Definitions:

Peripheral Nervous System

The portion of the nervous system that exists outside the brain and spinal cord, responsible for transmitting sensory information to the central nervous system and carrying motor commands to muscles and organs.

Pns

Abbreviation for Peripheral Nervous System, which includes nerves and ganglia outside of the brain and spinal cord.

Transient Ischemic Attack

Often called a mini-stroke, a transient episode of neurological dysfunction caused by the loss of blood flow to the brain, spinal cord, or retina, without acute infarction.

Abbreviation

A summarized form of a word or phrase.