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

question 13

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 collisions.
• B) Dark matter is mostly made of mini-black holes.
• C) Dark matter has much more angular momentum.
• D) Dark matter annihilates when it begins to get that dense.

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Definitions:

Continental Drift

The gradual movement of continents across the earth's surface over geological time, driven by plate tectonics.

Biological Species

A group of organisms capable of interbreeding and producing fertile offspring, sharing common characteristics.

South Pacific

A broad expanse of the Pacific Ocean, south of the equator, known for its many islands and diverse marine life.

Phyletic Gradualism

The idea that evolution occurs by a slow, steady accumulation of genetic changes over time; also called gradualism. Compare with punctuated equilibrium.