# Measuring Distances In Space--Post-test: Question Preview (ID: 29055)

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What is a constellation?
a) A. a pattern of stars visible in the night sky
b) B. a region of the sky described by the celestial sphere
c) both A and B
d) neither A nor B

What is the distance of an object from Earth if the object is 7 AU from the sun? (Assume that both Earth and the object are located in the same direction from the sun.)
a) 5 AU
b) 6 AU
c) 7 AU
d) 8 AU

How do light-years help astronomers to determine the ages of distant objects in space?
a) To calculate an object's age in years, astronomers must first know the object's distance from Earth in light-years.
b) To calculate an object's distance from Earth in light-years, astronomers must first know the object's age in years.
c) Light in space travels approximately 9.5 trillion km per year. Therefore, an object's distance from Earth in light-years is e
d) Light in space travels approximately 9.5 trillion km per year. Therefore, the images that astronomers see of distant objects

How do scientists define an astronomical unit?
a) the distance between Earth and the moon
b) the distance between Earth and the sun
c) the distance from one end of the solar system to the other
d) the distance from one end of the Milky Way galaxy to the other

How are objects located on the celestial sphere?
a) longitude and latitude
b) declination and parallax
c) declination and right ascension
d) left ascension and right ascension

What is a constellation?
a) a pattern of stars visible in the night sky
b) a region of the sky described by the celestial sphere
c) both A and B
d) neither A nor B

Approximately how many astronomical units are equivalent to one light-year?
a) 63,000 AU
b) 150,000 AU
c) 300,000 AU
d) 150,000 million AU

A star is located approximately 500 million light-years from Earth. Can a student determine the star's distance by calculating its parallax angle?
a) No. Parallax cannot be used to calculate the distances of objects more than approximately 300 light-years away.
b) Yes. Parallax enables astronomers to calculate the distances of objects fewer than 1 billion light-years away.
c) The student cannot use the parallax angle alone to determine the star's distance; the student must also know the star's age.
d) The student cannot use the parallax angle alone to determine the star's distance; the student must also know the star's size.

What is necessary to calculate a star's distance from Earth?
a) the parallax angle
b) the position of the star observed twice, six months apart
c) the distance between the two points of observation
d) all of the above

An astronomical unit is equivalent to
a) 150,000 miles
b) 150,000 kilometers
c) 150 million miles
d) 150 million kilometers

A light-year is a measure of
a) time
b) distance
c) speed
d) velocity

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