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2025 ASTR 1102 FINAL EXAM WITH ACCURATE
QUESTIONS AND VERIFIED ANSWERS COVERING
STELLAR EVOLUTION, GALAXIES, COSMOLOGY,
AND ADVANCED ASTRONOMY CONCEPTS.
A star has a mass of 100 times the mass of the sun and a luminosity of
1,000,000 that of the sun. How long will the star live in the main-sequence?
Provide your answer in units of years.
Hint: Take the main-sequence life-time of the sun to be 10 billion years
(10^10 years).
Select one:
a.
1 million years
b.
100 million years
c.
1 billion years
d.
10 million years - CORRECT ANSWER✔✔ 1 million years
Match the evolutionary stages of sun-like stars with their corresponding
main source of energy.
Protostar
White Dwarf
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Main-sequence star
Asymptotic Giant Branch (AGB) star
Horizontal Branch Star
Red Giant Star - CORRECT ANSWER✔✔ Gravitational contraction
None
Hydrogen burning in the core
Helium burning in shell around the core
Helium burning in the core
Hydrogen burning in shell around the core
During the Asymptotic Giant Branch (AGB) stage the core of star is made of
helium.
Select one:
True
False - CORRECT ANSWER✔✔ False
The reason that the shape of many planetary nebula appears to be 'bipolar'
could be due to:
Hint: There might be more than 1 right answer
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Select one or more:
a.
Anisotropies in the radiation pressure coming from deep within the AGB
star pushing more material out from the poles and less around the equator.
b.
Material concentrated in an equatorial disk around the star, channelling gas
toward the polar directions.
c.
The AGB star rotating so fast that it disrupts the shape of the outflowing
material.
d.
Interaction in a binary star system, such that the gravitational effects of the
secondary star funnel material out this way. - CORRECT ANSWER✔✔
Material concentrated in an equatorial disk around the star, channelling gas
toward the polar directions
In your view, what methods below do astronomers use to study the
Universe?
a.
Pen and paper
b.
Supercomputer simulations
c.
Telescopes
d.
All of the above - CORRECT ANSWER✔✔ All of the above
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Last week during class I mentioned that the U.S. is a global leader in
Astronomy research. How would you go about verifying that claim?
a.
Compare the number of publications in professional peer-reviewed
Astronomy journals coming from individuals and institutions in different
countries.
b.
Compare the total budget allocations for basic research between different
countries
c.
List number of space missions and planned new telescope constructions for
each country.
d.
All of the mentioned methods. - CORRECT ANSWER✔✔ All of the
mentioned methods
When one experiment verifies the predictions of a scientific theory, then
and only then it can become a law of physics.
Select one:
True
False - CORRECT ANSWER✔✔ False
Which of the following constellations can be used to locate both the stars
Aldebaran and Sirius?
Select one:
a.
2025 ASTR 1102 FINAL EXAM WITH ACCURATE
QUESTIONS AND VERIFIED ANSWERS COVERING
STELLAR EVOLUTION, GALAXIES, COSMOLOGY,
AND ADVANCED ASTRONOMY CONCEPTS.
A star has a mass of 100 times the mass of the sun and a luminosity of
1,000,000 that of the sun. How long will the star live in the main-sequence?
Provide your answer in units of years.
Hint: Take the main-sequence life-time of the sun to be 10 billion years
(10^10 years).
Select one:
a.
1 million years
b.
100 million years
c.
1 billion years
d.
10 million years - CORRECT ANSWER✔✔ 1 million years
Match the evolutionary stages of sun-like stars with their corresponding
main source of energy.
Protostar
White Dwarf
,2|Page
Main-sequence star
Asymptotic Giant Branch (AGB) star
Horizontal Branch Star
Red Giant Star - CORRECT ANSWER✔✔ Gravitational contraction
None
Hydrogen burning in the core
Helium burning in shell around the core
Helium burning in the core
Hydrogen burning in shell around the core
During the Asymptotic Giant Branch (AGB) stage the core of star is made of
helium.
Select one:
True
False - CORRECT ANSWER✔✔ False
The reason that the shape of many planetary nebula appears to be 'bipolar'
could be due to:
Hint: There might be more than 1 right answer
,3|Page
Select one or more:
a.
Anisotropies in the radiation pressure coming from deep within the AGB
star pushing more material out from the poles and less around the equator.
b.
Material concentrated in an equatorial disk around the star, channelling gas
toward the polar directions.
c.
The AGB star rotating so fast that it disrupts the shape of the outflowing
material.
d.
Interaction in a binary star system, such that the gravitational effects of the
secondary star funnel material out this way. - CORRECT ANSWER✔✔
Material concentrated in an equatorial disk around the star, channelling gas
toward the polar directions
In your view, what methods below do astronomers use to study the
Universe?
a.
Pen and paper
b.
Supercomputer simulations
c.
Telescopes
d.
All of the above - CORRECT ANSWER✔✔ All of the above
, 4|Page
Last week during class I mentioned that the U.S. is a global leader in
Astronomy research. How would you go about verifying that claim?
a.
Compare the number of publications in professional peer-reviewed
Astronomy journals coming from individuals and institutions in different
countries.
b.
Compare the total budget allocations for basic research between different
countries
c.
List number of space missions and planned new telescope constructions for
each country.
d.
All of the mentioned methods. - CORRECT ANSWER✔✔ All of the
mentioned methods
When one experiment verifies the predictions of a scientific theory, then
and only then it can become a law of physics.
Select one:
True
False - CORRECT ANSWER✔✔ False
Which of the following constellations can be used to locate both the stars
Aldebaran and Sirius?
Select one:
a.
