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Measuring Distances In Space--Post-test
Test Description: How is distance measured in space?
Instructions: Answer all questions to get your test result.
1) How do light-years help astronomers to determine the ages of distant objects in space?
A
Light in space travels approximately 9.5 trillion km per year. Therefore, the images that astronomers see of distant objects
B
Light in space travels approximately 9.5 trillion km per year. Therefore, an object's distance from Earth in light-years is e
C
To calculate an object's distance from Earth in light-years, astronomers must first know the object's age in years.
D
To calculate an object's age in years, astronomers must first know the object's distance from Earth in light-years.
2) What is a constellation?
A
neither A nor B
B
both A and B
C
A. a pattern of stars visible in the night sky
D
B. a region of the sky described by the celestial sphere
3) 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
8 AU
B
5 AU
C
6 AU
D
7 AU
4) How do scientists define an astronomical unit?
A
the distance from one end of the solar system to the other
B
the distance between Earth and the sun
C
the distance between Earth and the moon
D
the distance from one end of the Milky Way galaxy to the other
5) How are objects located on the celestial sphere?
A
declination and right ascension
B
longitude and latitude
C
left ascension and right ascension
D
declination and parallax
6) 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
neither A nor B
D
both A and B
7) Approximately how many astronomical units are equivalent to one light-year?
A
150,000 million AU
B
150,000 AU
C
300,000 AU
D
63,000 AU
8) 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
The student cannot use the parallax angle alone to determine the star's distance; the student must also know the star's size.
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
No. Parallax cannot be used to calculate the distances of objects more than approximately 300 light-years away.
9) What is necessary to calculate a star's distance from Earth?
A
all of the above
B
the distance between the two points of observation
C
the parallax angle
D
the position of the star observed twice, six months apart
10) An astronomical unit is equivalent to
A
150,000 miles
B
150,000 kilometers
C
150 million kilometers
D
150 million miles
11) A light-year is a measure of
A
distance
B
velocity
C
speed
D
time
*select an answer for all questions
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