Our Current Understanding of Galaxy Formation Suggests That the Visible

question 37

Multiple Choice

Our current understanding of galaxy formation suggests that the visible parts of galaxies

• A) form first and are incorporated into dark matter halos later.
• B) form only in the densest parts of dark matter halos.
• C) can tell you the total size of the dark matter halo.
• D) can tell you everything about the formation history of that galaxy.
• E) spread over distances larger than those of dark matter halos.

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Definitions:

Reflect

The act of light, sound, or heat waves being thrown back from a surface without being absorbed.

Stroma

A fluid space of the chloroplast, enclosed by the chloroplast inner membrane and surrounding the thylakoids; site of the reactions of the Calvin cycle.

Chloroplast

An organelle found in plant cells and some microorganisms that is the site of photosynthesis.

Fluid-filled Sac

A structure encapsulated by membranes containing liquid, which can serve various biological functions in animals and plants.