1|Page
ASTRO 1 EXAM 4 LATEST 2026-2027 ACTUAL EXAM WITH
COMPLETE QUESTIONS AND CORRECT DETAILED ANSWERS (100%
VERIFIED ANSWERS) |ALREADY GRADED A+| ||PROFESSOR
VERIFIED|| ||BRANDNEW!!!||
As we added darker matter in every case, what did this do to the
speeds of the inner and outer stars?
A: all speeds increased the same
B: the stars near center slowed down, but the outter ones
accelerated
C: all stars sped up but the outer stars gained the most
D: all were slowed down by the tidal drag of dark matter
E: there was no change - ANSWER-C: all stars sped up but the
outer stars gained the most
In clusters, if the majority of mass is dark matter, how would the
galaxies behave?
A: the clusters must condense into one huge elliptical galaxy
quickly
B: the inner members, close to the central giant elliptical, must
move the fastest
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C: all galaxies in the cluster are moving at the same speed, driven
by the 50/50 mix of luminous and dark matter
D: the outer galaxies are moving so fast, it looks like they must
escape the cluster, if there is not a huge amount of dark matter
present
E: the cluster would form an ultra massive black hole - ANSWER-
D: the outer galaxies are moving so fast, it looks like they must
escape the cluster, if there is not a huge amount of dark matter
present
How do we know that the universe is expanding?
A: the rotation curve of stars in the milky way
B: the motion of the andromeda galaxy
C: the doppler effect measured in many galaxies
D: inflation
E: all of above - ANSWER-C: the doppler effect measured in
many galaxies
How old is a cluster?
A: less than 10 million years old
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B: ten to a hundred million years old
C: several hundred million years old
D: a billion years old
E: its impossible to tell - ANSWER-B: ten to a hundred million
years old
The main sequence turnoff of a cluster tells us the cluster's
A: age
B: mass
C: distance
D: composition
E: size - ANSWER-A: age
Which of the following main sequence turnoffs indicates the oldest
globular cluster?
A: O5
B: O9
C: B7
D: B2
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E: G2 - ANSWER-E: G2
Which cluster is the oldest?
A: coma
B: M41
C: M67
D: praesepe
E: M11 - ANSWER-C: M67
Gas is added to the interstellar medium by supernovae and
planetary nebulae like this one. From what you remember of
stellar evolution, what kind of gas do you expect that to be?
A: hydrogen gas
B: helium gas
C: gas that has a mix of heavier elements in it
D: A and B
E: none of above - ANSWER-C: gas that has a mix of heavier
elements in it
ASTRO 1 EXAM 4 LATEST 2026-2027 ACTUAL EXAM WITH
COMPLETE QUESTIONS AND CORRECT DETAILED ANSWERS (100%
VERIFIED ANSWERS) |ALREADY GRADED A+| ||PROFESSOR
VERIFIED|| ||BRANDNEW!!!||
As we added darker matter in every case, what did this do to the
speeds of the inner and outer stars?
A: all speeds increased the same
B: the stars near center slowed down, but the outter ones
accelerated
C: all stars sped up but the outer stars gained the most
D: all were slowed down by the tidal drag of dark matter
E: there was no change - ANSWER-C: all stars sped up but the
outer stars gained the most
In clusters, if the majority of mass is dark matter, how would the
galaxies behave?
A: the clusters must condense into one huge elliptical galaxy
quickly
B: the inner members, close to the central giant elliptical, must
move the fastest
,2|Page
C: all galaxies in the cluster are moving at the same speed, driven
by the 50/50 mix of luminous and dark matter
D: the outer galaxies are moving so fast, it looks like they must
escape the cluster, if there is not a huge amount of dark matter
present
E: the cluster would form an ultra massive black hole - ANSWER-
D: the outer galaxies are moving so fast, it looks like they must
escape the cluster, if there is not a huge amount of dark matter
present
How do we know that the universe is expanding?
A: the rotation curve of stars in the milky way
B: the motion of the andromeda galaxy
C: the doppler effect measured in many galaxies
D: inflation
E: all of above - ANSWER-C: the doppler effect measured in
many galaxies
How old is a cluster?
A: less than 10 million years old
,3|Page
B: ten to a hundred million years old
C: several hundred million years old
D: a billion years old
E: its impossible to tell - ANSWER-B: ten to a hundred million
years old
The main sequence turnoff of a cluster tells us the cluster's
A: age
B: mass
C: distance
D: composition
E: size - ANSWER-A: age
Which of the following main sequence turnoffs indicates the oldest
globular cluster?
A: O5
B: O9
C: B7
D: B2
, 4|Page
E: G2 - ANSWER-E: G2
Which cluster is the oldest?
A: coma
B: M41
C: M67
D: praesepe
E: M11 - ANSWER-C: M67
Gas is added to the interstellar medium by supernovae and
planetary nebulae like this one. From what you remember of
stellar evolution, what kind of gas do you expect that to be?
A: hydrogen gas
B: helium gas
C: gas that has a mix of heavier elements in it
D: A and B
E: none of above - ANSWER-C: gas that has a mix of heavier
elements in it
