Compared with Stars in the Disk, Orbits of Stars in the Halo

question 49

Multiple Choice

Compared with stars in the disk, orbits of stars in the halo

• A)do not have to be around the galactic center.
• B)are confined to a relatively thin plane.
• C)are elliptical, orbiting in the same direction.
• D)are elliptical, with random orientations.
• E)do not have to pass through the plane of the galaxy.

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Definitions:

Exhaustible Resource

A natural resource, such as oil or coal, that has a finite supply and can be depleted if used unsustainably.

User Cost

The cost of using a product or service, taking into account factors such as depreciation, wear and tear, and opportunity cost of using the asset rather than investing the money elsewhere.

Depletable Resource

A natural resource that can be diminished by use, such as fossil fuels or minerals, which are not renewable over short time spans.

User Cost

The cost of using a good or service, including the actual price paid and other sacrifices (like time or effort).