If the Entire Galaxy (With a Diameter of 100,000 Light

question 55

Multiple Choice

If the entire galaxy (with a diameter of 100,000 light years) were represented by a circle with a diameter of 4,400 km (similar to the width of the continental United States) , then how far apart would be the Sun and its nearest stellar neighbor, Proxima Centauri (which is 4.2 light years away) ?

• A)about 200 meters (about 2 football fields)
• B)about 20 meters (about the size of a large classroom)
• C)about 0.2 meters (about the length of an adult's forearm)
• D)about 2 meters (about 2 long footsteps)

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Definitions:

Survivorship Curve

Graph showing how many members of a cohort remain alive over time.

Death Rate

The average number of deaths per unit of population over a given period of time.

Ecological Footprint

A measure of how much land and water area a human population requires to produce the resources it consumes and to absorb its wastes, using prevailing technology.

Earth's Surface

The outermost layer of the Earth that includes both land and water bodies.