Which of These Would NOT Be Useful for Measuring the Mass

question 34

Multiple Choice

Which of these would NOT be useful for measuring the mass of the dark matter halo in a spiral galaxy?

• A) H\(\alpha\) emission from H II regions in the spiral disk
• B) the velocities of satellite dwarf galaxies surrounding a spiral galaxy
• C) absorption lines in the spectra of its globular clusters
• D) the velocities of star clusters in the outer disk
• E) all of these can be used to measure the mass of the dark matter

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Definitions:

Vestibular Neurons

Neurons that convey information from the vestibular system, which is involved in balance and spatial orientation.

Cerebrum

The largest part of the brain, consisting of the right and left hemispheres, responsible for voluntary activities and higher functions like thought and action.

Crista Ampullaris

A sensory organ located within the ampulla of each semicircular duct in the inner ear, detecting rotation of the head.

Lumen

The inside space of a tubular structure, such as an artery or intestine.