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2025 ASTR 1102 FINAL EXAM WITH ACCURATE QUESTIONS AND
VERIFIED ANSWERS COVERING STELLAR EVOLUTION, GALAXIES,
COSMOLOGY, AND ADVANCED ASTRONOMY CONCEPTS.
You are given a star's distance modulus and the information that there is a lot of dust along the
line of sight. Is the distance you estimate using the distance modulus formula:
A) Underestimated?
B) Overestimated?
C) Unaffected? - ANSWER-B
A star has an apparent magnitude of +4.3 but it lays behind clouds of interstellar dust. What
would be the apparent magnitude of the star if there was no dust along the line of sight?
A) +4.3
B) Higher than +4.3
C) Lower than +4.3
D) Meh...another one bites the dust! - ANSWER-C
Star A and Star B have the same temperature.
Star A is a lot more luminous than Star B.
A) Star A is much larger than star B
B) Star A is much smaller than star B
C) Star A is closer than star B
D) Star A is further away than star B - ANSWER-A
Star 1 has temperature 10,000 degrees and radius 5 Rsun.
Star 2 has temperature 5,000 degrees and radius 10 Rsun.
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What is the ratio of their luminosities (L1/L2)?
A) 1
B) 2
C) 4
D) 16 - ANSWER-C
Is our Sun typical?
A) Yes, in the middle of the HR diagram
B) No, it's brighter than most stars - ANSWER-A
Which of the following stellar quantities is harder to measure?
A) Temperature
B) Distance
C) Mass
D) Brightness
E) Luminosity - ANSWER-C
Which of these stars is coolest?
A) A star
B) G star
C) M star
D) F star
E) K star - ANSWER-C
Which of these stars is hottest?
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A) A star
B) G star
C) M star
D) F star
E) K star - ANSWER-A
Where are most massive of the main-sequence stars located along the main-sequence curve of
the HR diagram?
A) Upper left part
B) Around the location of the sun
C) Lower right part - ANSWER-A
Where are the white dwarf stars located in the HR diagram?
A) Upper-left corner
B) Lower-right corner
C) Lower-left corner
D) In the middle - ANSWER-C
In what direction in the HR diagram will a star like the sun move once it exhausts hydrogen in its
core?
A) Towards the lower left corner
B) Towards the upper left corner
C) Towards the upper right corner
D) Towards the lower right corner - ANSWER-C
You observe a star in the Milky Way galaxy. What is the change that it's not going to be in the
Main-Sequence?
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A) 90%
B) 50%
C) 10%
D) 20% - ANSWER-C
If you were around for 5 more billion years to watch the sun evolve to its death, how would it
move as it ages on top of the HR diagram?
A) From the main-sequence, to the blue supergiant class, then down to become a white dwarf
B) From the main-sequence, to the red giant class, then down to become a white dwarf
C) From the main-sequence directly to the white dwarf class - ANSWER-B
What type of stars ionize hydrogen in HII regions (nebulae)?
A) G type stars (like the sun)
B) O and B-type stars
C) K-type stars
D) F-type stars - ANSWER-B
"Bok Globules" are associated with:
A) the birthplaces of single stars
B) the birthplaces of planets
C) the birthplaces of binary or multiple stellar systems
D) the birthplaces of galaxies - ANSWER-C
2025 ASTR 1102 FINAL EXAM WITH ACCURATE QUESTIONS AND
VERIFIED ANSWERS COVERING STELLAR EVOLUTION, GALAXIES,
COSMOLOGY, AND ADVANCED ASTRONOMY CONCEPTS.
You are given a star's distance modulus and the information that there is a lot of dust along the
line of sight. Is the distance you estimate using the distance modulus formula:
A) Underestimated?
B) Overestimated?
C) Unaffected? - ANSWER-B
A star has an apparent magnitude of +4.3 but it lays behind clouds of interstellar dust. What
would be the apparent magnitude of the star if there was no dust along the line of sight?
A) +4.3
B) Higher than +4.3
C) Lower than +4.3
D) Meh...another one bites the dust! - ANSWER-C
Star A and Star B have the same temperature.
Star A is a lot more luminous than Star B.
A) Star A is much larger than star B
B) Star A is much smaller than star B
C) Star A is closer than star B
D) Star A is further away than star B - ANSWER-A
Star 1 has temperature 10,000 degrees and radius 5 Rsun.
Star 2 has temperature 5,000 degrees and radius 10 Rsun.
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What is the ratio of their luminosities (L1/L2)?
A) 1
B) 2
C) 4
D) 16 - ANSWER-C
Is our Sun typical?
A) Yes, in the middle of the HR diagram
B) No, it's brighter than most stars - ANSWER-A
Which of the following stellar quantities is harder to measure?
A) Temperature
B) Distance
C) Mass
D) Brightness
E) Luminosity - ANSWER-C
Which of these stars is coolest?
A) A star
B) G star
C) M star
D) F star
E) K star - ANSWER-C
Which of these stars is hottest?
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A) A star
B) G star
C) M star
D) F star
E) K star - ANSWER-A
Where are most massive of the main-sequence stars located along the main-sequence curve of
the HR diagram?
A) Upper left part
B) Around the location of the sun
C) Lower right part - ANSWER-A
Where are the white dwarf stars located in the HR diagram?
A) Upper-left corner
B) Lower-right corner
C) Lower-left corner
D) In the middle - ANSWER-C
In what direction in the HR diagram will a star like the sun move once it exhausts hydrogen in its
core?
A) Towards the lower left corner
B) Towards the upper left corner
C) Towards the upper right corner
D) Towards the lower right corner - ANSWER-C
You observe a star in the Milky Way galaxy. What is the change that it's not going to be in the
Main-Sequence?
, 4|Page
A) 90%
B) 50%
C) 10%
D) 20% - ANSWER-C
If you were around for 5 more billion years to watch the sun evolve to its death, how would it
move as it ages on top of the HR diagram?
A) From the main-sequence, to the blue supergiant class, then down to become a white dwarf
B) From the main-sequence, to the red giant class, then down to become a white dwarf
C) From the main-sequence directly to the white dwarf class - ANSWER-B
What type of stars ionize hydrogen in HII regions (nebulae)?
A) G type stars (like the sun)
B) O and B-type stars
C) K-type stars
D) F-type stars - ANSWER-B
"Bok Globules" are associated with:
A) the birthplaces of single stars
B) the birthplaces of planets
C) the birthplaces of binary or multiple stellar systems
D) the birthplaces of galaxies - ANSWER-C
