Why Can't Dark Matter Halos Collapse to Be the Same

question 88

Multiple Choice

Why can't dark matter halos collapse to be the same size as the visible parts of galaxies?

• A) Dark matter can't dissipate its energy through radiation from collisions.
• B) Dark matter is made mostly of mini-black holes.
• C) Dark matter has much more angular momentum.
• D) Dark matter annihilates when it begins to get that dense.
• E) Dark matter particles are too large to collapse that much.

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Definitions:

Nonexperimental Method

Use of measurement of variables to determine whether variables are related to one another. Also called correlational method.

Nonexperimental Method

A research method where the researcher observes and records behavior without manipulating any variables.

Experimental Control

The process of keeping variables constant or regulating external factors to ensure that observed effects are due to manipulated variables only.

Independent Variable

A manipulated factor in an experiment, chosen to determine its potential effect on a dependent outcome.