Astronomy exam 3 Questions and
Answers Graded A+
What value tells us how bright an object will appear from Earth? - Correct answer-
Apparent Magnitude
What values tells us about the object's actual brightness? - Correct answer-
Absolute Magnitude
The full Moon has an apparent magnitude of -12.6, and when Mars is as its
brightness in the night sky, its apparent magnitude is +2.0. Which of the two
objects has the bigger apparent magnitude number? - Correct answer-Mars
The full Moon has an apparent magnitude of -12.6, and when Mars is as its
brightness in the night sky, its apparent magnitude is +2.0. Which object will look
brighter from Earth, the full Moon or Mars? How do you know? - Correct answer-
The Moon because it has a smaller number
The full Moon has an apparent magnitude of -12.6, and when Mars is as its
brightness in the night sky, its apparent magnitude is +2.0. If a new object were
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,discovered that looked even dimmer from Earth than Mars does, make up a
possible apparent magnitude number for it. - Correct answer-+5.0
The star Lee has an apparent magnitude of 0.1 and is located about 250 parsecs
away from Earth. Which of the following is most likely the absolute magnitude for
Lee? Explain your reasoning. - Correct answer--6.9; Because since its so far away
it appears dimmer but it actually would be very bright if it was closer.
What is the variable used to represent apparent magnitude? - Correct answer-m
What is the variable used to represent absolute magnitude? - Correct answer-M
Star A: m=1 M=1
Star B: m=1 M=2
Star C: m=5 M=4
Star D: m=4 M=4
Which object appears bright from Earth: Star C or Star D? Explain your reasoning.
- Correct answer-Star D, because it has the lower number indicating it is brighter
Star A: m=1 M=1
Star B: m=1 M=2
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, Star C: m=5 M=4
Star D: m=4 M=4
Which object is actually brighter: Star A or Star D? Explain your reasoning. -
Correct answer-Star A, because it has the lower number indicating it is brighter
Star A: m=1 M=1
Star B: m=1 M=2
Star C: m=5 M=4
Star D: m=4 M=4
For Stars A-D, state whether the star is closer than, farther than, or exactly 10
parsecs away from Earth. Explain your reasoning. - Correct answer-Closer than 10
parsecs: Star B
Farther than 10 parsecs: Star C
Exactly 10 parsecs: Star A and Star D
What does m=M mean? - Correct answer-The apparent magnitude and the absolute
magnitude are equal placing the stars exactly 10 parsecs away
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Answers Graded A+
What value tells us how bright an object will appear from Earth? - Correct answer-
Apparent Magnitude
What values tells us about the object's actual brightness? - Correct answer-
Absolute Magnitude
The full Moon has an apparent magnitude of -12.6, and when Mars is as its
brightness in the night sky, its apparent magnitude is +2.0. Which of the two
objects has the bigger apparent magnitude number? - Correct answer-Mars
The full Moon has an apparent magnitude of -12.6, and when Mars is as its
brightness in the night sky, its apparent magnitude is +2.0. Which object will look
brighter from Earth, the full Moon or Mars? How do you know? - Correct answer-
The Moon because it has a smaller number
The full Moon has an apparent magnitude of -12.6, and when Mars is as its
brightness in the night sky, its apparent magnitude is +2.0. If a new object were
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,discovered that looked even dimmer from Earth than Mars does, make up a
possible apparent magnitude number for it. - Correct answer-+5.0
The star Lee has an apparent magnitude of 0.1 and is located about 250 parsecs
away from Earth. Which of the following is most likely the absolute magnitude for
Lee? Explain your reasoning. - Correct answer--6.9; Because since its so far away
it appears dimmer but it actually would be very bright if it was closer.
What is the variable used to represent apparent magnitude? - Correct answer-m
What is the variable used to represent absolute magnitude? - Correct answer-M
Star A: m=1 M=1
Star B: m=1 M=2
Star C: m=5 M=4
Star D: m=4 M=4
Which object appears bright from Earth: Star C or Star D? Explain your reasoning.
- Correct answer-Star D, because it has the lower number indicating it is brighter
Star A: m=1 M=1
Star B: m=1 M=2
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, Star C: m=5 M=4
Star D: m=4 M=4
Which object is actually brighter: Star A or Star D? Explain your reasoning. -
Correct answer-Star A, because it has the lower number indicating it is brighter
Star A: m=1 M=1
Star B: m=1 M=2
Star C: m=5 M=4
Star D: m=4 M=4
For Stars A-D, state whether the star is closer than, farther than, or exactly 10
parsecs away from Earth. Explain your reasoning. - Correct answer-Closer than 10
parsecs: Star B
Farther than 10 parsecs: Star C
Exactly 10 parsecs: Star A and Star D
What does m=M mean? - Correct answer-The apparent magnitude and the absolute
magnitude are equal placing the stars exactly 10 parsecs away
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