ASTRO 7N EXAM 3
ASTRO 7N EXAM 3 INCLUDES ACCURATE AND VERIFIED QUESTIONS COVERING
FUNDAMENTAL ASTRONOMY CONCEPTS SUCH AS THE SOLAR SYSTEM,
PHASES OF THE MOON, PLANETARY MOTION, GRAVITY, LIGHT AND
TELESCOPES, AND THE HISTORICAL DEVELOPMENT OF ASTRONOMICAL
MODELS.DESIGNED FOR STUDENTS IN INTRODUCTORY ASTRONOMY COURSES
SUCH AS THOSE OFFERED AT PENN STATE
Many of the brightest 100 stars viewed from Earth are not on the main sequence(even though
most stars are) because:
A: only high mass stars formed near to us in the Galaxy.
B: the most luminous stars are giants and supergiants that have already finished their main
sequence lifetimes.
C: our region of the Galaxy is very young.
D: the main sequence is the shortest part of a star's life so stars do not spend much time there.
E: our region of the Galaxy is very old.
B: the most luminous stars are giants and supergiants that have already finished their main
sequence lifetimes.
A 2-solar mass main sequence star is at the same distance as a 0.2-solar mass main sequence
star. Which star appears brighter?
A: depends on the phase of the Moon
B: the 2 solar mass main sequence star appears brighter
C: the stars are approximately the same brightness
D: the 0.2 solar mass main sequence star appears brighter
E: we cannot tell with the information given
B: the 2 solar mass main sequence star appears brighter
The temperature of the photosphere of the Sun is closest to ...
A: 107 Kelvin
B: 106 Kelvin
C: 100 Kelvin
D: 600,000 Kelvin
E: 6000 Kelvin
E: 6000 Kelvin
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, ASTRO 7N EXAM 3
An estimate of the number of communicating/technological civilizations that we expect in our
Galaxy would have a larger number if ...
A: the average lifetime of a communicating civilization was smaller
B: the star formation rate in our Galaxy was smaller
C: the average number of planets that could support life for each star was larger
D: it was more difficult for life to develop intelligence, once life had formed
E: a smaller percentage of stars formed planets
C: the average number of planets that could support life for each star was larger
If the Sun had twice its mass, then which of the planets would be in its habitable zone?
A: Mercury
B: Venus
C: Earth
D: Neptune
E: Jupiter
E: Jupiter
In the transit method of finding extrasolar planets, the distance of the planet from its star is
found from:
A: Kepler's 3rd law using the period of the planet's orbit (how often a transit occurs).
B: The luminosity of its star divided by 4 pi times the radius squared.
C: the spectral type of the star, which is related to which chemical elements are present at
different temperatures
D: what fraction of the light of the star is blocked by the planet when a transit occurs
E: the Drake equation
A: Kepler's 3rd law using the period of the planet's orbit (how often a transit occurs)
How do astronomers measure the temperature of stars?
A: The inverse square law is used.
B: Temperature is determined from the radius of the star that is measured by radar.
C: By looking at which absorption lines are present in the star's spectrum.
D: The rate of change of the color of the star is measured.
E: By comparing the luminosity and apparent brightnesses.
C: By looking at which absorption lines are present in the star's spectrum.
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, ASTRO 7N EXAM 3
If two stars are the same temperature, how can one be more luminous than the other?
A: It can have a larger reaction rate in the core.
B: It can be a different spectral type.
C: It can have stronger magnetic fields.
D: It can be closer
E: It can have a larger radius.
E: It can have a larger radius.
A large luminosity star ...
A: is always at a larger distance than a small luminosity star
B: emits more light than a low luminosity star
C: is always redder than a star with a small luminosity
D: is at a lower temperature than a small luminosity starE: is always at a smaller distance than a
small luminosity star
B: emits more light than a low luminosity star
If a red giant appears the same brightness as a red main sequence star, which one is farther
away?
A: the red giant
B: we can't tell
C: it depends on the phase of the Moon
D: the main sequence starE: they are at the same distance
A: the red giant
The heaviest nuclei of all are formed ...
A: during helium burning
B: as part of the p-p chain
C: during carbon burning
D: during a supernova explosion
E: during all stages of stellar evolution of massive stars
D: during a supernova explosion
Fill in the blank in the following chemical reaction that occurs in the Sun:Hydrogen-2 + proton =
_____ + energy:
A: Hydrogen-2
B: Hydrogen-1
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ASTRO 7N EXAM 3 INCLUDES ACCURATE AND VERIFIED QUESTIONS COVERING
FUNDAMENTAL ASTRONOMY CONCEPTS SUCH AS THE SOLAR SYSTEM,
PHASES OF THE MOON, PLANETARY MOTION, GRAVITY, LIGHT AND
TELESCOPES, AND THE HISTORICAL DEVELOPMENT OF ASTRONOMICAL
MODELS.DESIGNED FOR STUDENTS IN INTRODUCTORY ASTRONOMY COURSES
SUCH AS THOSE OFFERED AT PENN STATE
Many of the brightest 100 stars viewed from Earth are not on the main sequence(even though
most stars are) because:
A: only high mass stars formed near to us in the Galaxy.
B: the most luminous stars are giants and supergiants that have already finished their main
sequence lifetimes.
C: our region of the Galaxy is very young.
D: the main sequence is the shortest part of a star's life so stars do not spend much time there.
E: our region of the Galaxy is very old.
B: the most luminous stars are giants and supergiants that have already finished their main
sequence lifetimes.
A 2-solar mass main sequence star is at the same distance as a 0.2-solar mass main sequence
star. Which star appears brighter?
A: depends on the phase of the Moon
B: the 2 solar mass main sequence star appears brighter
C: the stars are approximately the same brightness
D: the 0.2 solar mass main sequence star appears brighter
E: we cannot tell with the information given
B: the 2 solar mass main sequence star appears brighter
The temperature of the photosphere of the Sun is closest to ...
A: 107 Kelvin
B: 106 Kelvin
C: 100 Kelvin
D: 600,000 Kelvin
E: 6000 Kelvin
E: 6000 Kelvin
1|Page
, ASTRO 7N EXAM 3
An estimate of the number of communicating/technological civilizations that we expect in our
Galaxy would have a larger number if ...
A: the average lifetime of a communicating civilization was smaller
B: the star formation rate in our Galaxy was smaller
C: the average number of planets that could support life for each star was larger
D: it was more difficult for life to develop intelligence, once life had formed
E: a smaller percentage of stars formed planets
C: the average number of planets that could support life for each star was larger
If the Sun had twice its mass, then which of the planets would be in its habitable zone?
A: Mercury
B: Venus
C: Earth
D: Neptune
E: Jupiter
E: Jupiter
In the transit method of finding extrasolar planets, the distance of the planet from its star is
found from:
A: Kepler's 3rd law using the period of the planet's orbit (how often a transit occurs).
B: The luminosity of its star divided by 4 pi times the radius squared.
C: the spectral type of the star, which is related to which chemical elements are present at
different temperatures
D: what fraction of the light of the star is blocked by the planet when a transit occurs
E: the Drake equation
A: Kepler's 3rd law using the period of the planet's orbit (how often a transit occurs)
How do astronomers measure the temperature of stars?
A: The inverse square law is used.
B: Temperature is determined from the radius of the star that is measured by radar.
C: By looking at which absorption lines are present in the star's spectrum.
D: The rate of change of the color of the star is measured.
E: By comparing the luminosity and apparent brightnesses.
C: By looking at which absorption lines are present in the star's spectrum.
2|Page
, ASTRO 7N EXAM 3
If two stars are the same temperature, how can one be more luminous than the other?
A: It can have a larger reaction rate in the core.
B: It can be a different spectral type.
C: It can have stronger magnetic fields.
D: It can be closer
E: It can have a larger radius.
E: It can have a larger radius.
A large luminosity star ...
A: is always at a larger distance than a small luminosity star
B: emits more light than a low luminosity star
C: is always redder than a star with a small luminosity
D: is at a lower temperature than a small luminosity starE: is always at a smaller distance than a
small luminosity star
B: emits more light than a low luminosity star
If a red giant appears the same brightness as a red main sequence star, which one is farther
away?
A: the red giant
B: we can't tell
C: it depends on the phase of the Moon
D: the main sequence starE: they are at the same distance
A: the red giant
The heaviest nuclei of all are formed ...
A: during helium burning
B: as part of the p-p chain
C: during carbon burning
D: during a supernova explosion
E: during all stages of stellar evolution of massive stars
D: during a supernova explosion
Fill in the blank in the following chemical reaction that occurs in the Sun:Hydrogen-2 + proton =
_____ + energy:
A: Hydrogen-2
B: Hydrogen-1
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