Globular clusters can be used to estimate the distance to galaxies by measuring the clusters' ____.
a. angular diameter
b. mass
c. orbital speed
d. age
e. recession velocity
Question 2Jenny, who lives on a farm in a rural part of New York, calls her cousin, Karen, in Brooklyn to tell her that she can see the Milky Way in tonight's night sky. However, Karen says she can't see it at all. What is preventing Karen from seeing the Milky Way in the night sky?
a. Karen does not have a strong enough telescope.
b. Karen lives in an area with light pollution.
c. Karen isn't in the same hemisphere as Jenny.
d. Karen needs to use a reflecting telescope.
e. Karen isn't looking in the right direction.
Question 3Cepheid variables are useful in measuring the distance to ____.
a. globular clusters and dwarf galaxies around the Milky way, but nothing farther
b. globular clusters and the Andromeda Galaxy, but not more distant objects
c. galaxies that are within 30 megaparsecs, a relatively short distance
d. galaxies that are moderately far away, up to about 500 megaparsecs
e. galaxies and galactic clusters within a gigaparsec of the Milky Way
Question 4Light gathering power and resolving power both depend on what characteristic of a telescope?
a. number of lenses
b. magnification
c. focal length
d. location
e. diameter
Question 5In general, ____.
a. spiral galaxies are the most common galaxies, and are make up most of the cataloged galaxies
b. elliptical galaxies are the most common galaxies, and are make up most of the cataloged galaxies
c. most cataloged galaxies are spiral, but dwarf galaxies are the most common
d. most cataloged galaxies are elliptical, but spiral galaxies are the most common
e. most cataloged galaxies are spiral, but elliptical galaxies are the most common.
Question 6Diffraction, optical quality, and atmospheric conditions all contribute to the limitations of what power of a telescope?
a. resolving power
b. magnifying power
c. diffraction power
d. light gathering power
e. focusing power
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