What Observations Suggest the Mass of the Galaxy Goes Much

question 30

Multiple Choice

What observations suggest the mass of the Galaxy goes much farther out than its visibledisk?

• A)21 cm maps of the spiral arms
• B)the rotation curve of the outermost portions of the disk
• C)the orbits of the open clusters in the disk
• D)infrared observations of distant brown dwarfs
• E)X-ray images of other galaxies' disks from Chandra

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Definitions:

Communicating

The process of sharing information, feelings, or thoughts between individuals or groups through speaking, writing, or other methods.

Retreat

The act of withdrawing or moving back, often used in the context of strategic withdrawals in military operations or as a means of finding peace and quiet.

Self-Monitoring

The practice of attentively observing one's own behavior and responses in various situations to adjust them in order to achieve desired outcomes.

Low

Refers to a position, level, or figure that is less than average or normal; often associated with quantity, quality, or degree.