Although We Know Less About Dark Matter in Elliptical Galaxies

question 116

Multiple Choice

Although we know less about dark matter in elliptical galaxies than in spiral galaxies, what does current evidence suggest?

• A)Elliptical galaxies probably contain about the same proportion of their mass in the form of dark matter as do spiral galaxies.
• B)Unlike the broad distribution of dark matter in spiral galaxies, elliptical galaxies probably contain dark matter only near their centers.
• C)Elliptical galaxies probably contain far more dark matter than spiral galaxies.
• D)Elliptical galaxies probably contain far less dark matter than spiral galaxies.

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Definitions:

Thoracic Duct

The largest lymphatic vessel in the body, which drains lymph from the lower half of the body and the left upper part into the bloodstream.

Lymphatic Duct

A large vessel in the lymphatic system that drains lymph from the lymphatic vessels into the venous system.

Vena Cavae

The two major veins (superior vena cava and inferior vena cava) that carry deoxygenated blood from the body back to the heart.

Cisterna Chyli

A dilated sac at the lower end of the thoracic duct into which lymph from the intestinal trunk and two lumbar lymphatic trunks flows.