lOMoARcPSD|24365327
The gas in a planetary nebula is composed of
primarily hydrogen from the post-asymptotic giant branch star.
hydrogen and elements processed in the core of the post-asymptotic giant branch star.
primarily hydrogen from the surrounding interstellar medium.
primarily helium from the post-asymptotic giant branch star.
hydrogen and elements processed in the core of the post-asymptotic giant branch star.
When two atomic nuclei come together to form a new species of atom, what force
engages to keep them together?
electric force
gravity
weak force
strong nuclear force
strong nuclear force
The event horizon of a black hole is defined as the
point of maximum gravity.
radius at which the escape speed equals the speed of light.
radius of the original neutron star before it became a black hole.
point at which shock waves emanate from the strong gravitational distortion the black
hole creates in the fabric of spacetime.
radius at which the escape speed equals the speed of light.
The carbon-nitrogen-oxygen (CNO) cycle in high-mass main-sequence stars burns
________ to ________ in their cores.
carbon; nitrogen
carbon; oxygen
helium; carbon.
hydrogen; helium
hydrogen; helium
The equivalence principle says that
at any radius inside a star, the outward gas pressure must balance the weight of the
material on top.
the universe is homogeneous and isotropic.
mass and energy are interchangeable, and neither can be destroyed.
being stationary in a gravitational field is the same as being in an accelerated reference
frame.
, lOMoARcPSD|24365327
being stationary in a gravitational field is the same as being in an accelerated reference
frame.
We can identify only a small fraction of all the pulsars that exist in our galaxy because
most have evolved to become black holes, which emit no light.
few swing their beam of synchrotron emission in our direction.
gas and dust efficiently block radio photons.
they are too small to see.
few swing their beam of synchrotron emission in our direction.
Which of the following figures represents the youngest star cluster?
Figure A
Figure C
Figure B
Figure D
Figure A
What occurs if a white dwarf exceeds the Chandrasekhar limit?
The white dwarf contracts to a smaller, hotter object.
A nova explosion occurs.
Nothing; the white dwarf just gets bigger.
A Type Ia supernova explosion occurs.
A Type Ia supernova explosion occurs.
You observed three different star clusters and found that the main-sequence turnoff
stars in cluster 1 had spectral type A, the main-sequence turnoff stars in cluster 2 had
spectral type B, and the main-sequence turnoff stars in cluster 3 had spectral type G.
Which star cluster is the youngest?
cluster 1
cluster 2
It is impossible to determine their ages given only the spectral types.
cluster 3
cluster 2
During which phase of the evolution of a low-mass star does it have two separate
regions of nuclear burning occurring in its interior?
white dwarf
main sequence
horizontal branch
red giant
, lOMoARcPSD|24365327
horizontal branch
Hydrostatic equilibrium is a balance between
core temperature and surface temperature.
forces due to radiation pressure and gravity.
heat and rotation.
radiation and heat.
forces due to radiation pressure and gravity.
Stars generally exhibit
an absorption spectrum.
both emission and absorption spectra.
an emission spectrum.
a continuous spectrum.
an absorption spectrum.
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Which sequence correctly lists the spectral classes of stars in order of decreasing
temperature (from hottest to coolest)?
ABFGKMO
AFOBMGK
OBAFGKM
, lOMoARcPSD|24365327
OABGFMK
OBAFGKM
Which of the following processes did NOT contribute to Earth's secondary atmosphere?
volcanism
oxidation
accretion
impacts
oxidation
What causes tides?
magnetic forces
gravitational forces
rapid rotation
tectonic activity
gravitational forces
Astronomers initially used the radial velocity method to discover exoplanets, but the
many discoveries of which type of object may be an example of a selection effect?
Planets wandering freely through the Milky Way, not orbiting a star.
Earth-sized planets at distances of 10 AU from their parent stars
"Hot Jupiters"
Extrasolar planets with highly elliptical orbits, unlike planets in our solar system.
Earth-sized planets at distances of 10 AU from their parent stars
Which of the following is now geologically inactive?
Triton
Io
Ganymede
Enceladus
Ganymede
When a comet comes close to the Sun, its volatile ice sublimates and transforms
directly from the solid to ________ phase.
crystalline
ionized
liquid
gas
gas
Each season is 42 years long on Uranus because
The gas in a planetary nebula is composed of
primarily hydrogen from the post-asymptotic giant branch star.
hydrogen and elements processed in the core of the post-asymptotic giant branch star.
primarily hydrogen from the surrounding interstellar medium.
primarily helium from the post-asymptotic giant branch star.
hydrogen and elements processed in the core of the post-asymptotic giant branch star.
When two atomic nuclei come together to form a new species of atom, what force
engages to keep them together?
electric force
gravity
weak force
strong nuclear force
strong nuclear force
The event horizon of a black hole is defined as the
point of maximum gravity.
radius at which the escape speed equals the speed of light.
radius of the original neutron star before it became a black hole.
point at which shock waves emanate from the strong gravitational distortion the black
hole creates in the fabric of spacetime.
radius at which the escape speed equals the speed of light.
The carbon-nitrogen-oxygen (CNO) cycle in high-mass main-sequence stars burns
________ to ________ in their cores.
carbon; nitrogen
carbon; oxygen
helium; carbon.
hydrogen; helium
hydrogen; helium
The equivalence principle says that
at any radius inside a star, the outward gas pressure must balance the weight of the
material on top.
the universe is homogeneous and isotropic.
mass and energy are interchangeable, and neither can be destroyed.
being stationary in a gravitational field is the same as being in an accelerated reference
frame.
, lOMoARcPSD|24365327
being stationary in a gravitational field is the same as being in an accelerated reference
frame.
We can identify only a small fraction of all the pulsars that exist in our galaxy because
most have evolved to become black holes, which emit no light.
few swing their beam of synchrotron emission in our direction.
gas and dust efficiently block radio photons.
they are too small to see.
few swing their beam of synchrotron emission in our direction.
Which of the following figures represents the youngest star cluster?
Figure A
Figure C
Figure B
Figure D
Figure A
What occurs if a white dwarf exceeds the Chandrasekhar limit?
The white dwarf contracts to a smaller, hotter object.
A nova explosion occurs.
Nothing; the white dwarf just gets bigger.
A Type Ia supernova explosion occurs.
A Type Ia supernova explosion occurs.
You observed three different star clusters and found that the main-sequence turnoff
stars in cluster 1 had spectral type A, the main-sequence turnoff stars in cluster 2 had
spectral type B, and the main-sequence turnoff stars in cluster 3 had spectral type G.
Which star cluster is the youngest?
cluster 1
cluster 2
It is impossible to determine their ages given only the spectral types.
cluster 3
cluster 2
During which phase of the evolution of a low-mass star does it have two separate
regions of nuclear burning occurring in its interior?
white dwarf
main sequence
horizontal branch
red giant
, lOMoARcPSD|24365327
horizontal branch
Hydrostatic equilibrium is a balance between
core temperature and surface temperature.
forces due to radiation pressure and gravity.
heat and rotation.
radiation and heat.
forces due to radiation pressure and gravity.
Stars generally exhibit
an absorption spectrum.
both emission and absorption spectra.
an emission spectrum.
a continuous spectrum.
an absorption spectrum.
Upgrade to remove ads
Only $35.99/year
Which sequence correctly lists the spectral classes of stars in order of decreasing
temperature (from hottest to coolest)?
ABFGKMO
AFOBMGK
OBAFGKM
, lOMoARcPSD|24365327
OABGFMK
OBAFGKM
Which of the following processes did NOT contribute to Earth's secondary atmosphere?
volcanism
oxidation
accretion
impacts
oxidation
What causes tides?
magnetic forces
gravitational forces
rapid rotation
tectonic activity
gravitational forces
Astronomers initially used the radial velocity method to discover exoplanets, but the
many discoveries of which type of object may be an example of a selection effect?
Planets wandering freely through the Milky Way, not orbiting a star.
Earth-sized planets at distances of 10 AU from their parent stars
"Hot Jupiters"
Extrasolar planets with highly elliptical orbits, unlike planets in our solar system.
Earth-sized planets at distances of 10 AU from their parent stars
Which of the following is now geologically inactive?
Triton
Io
Ganymede
Enceladus
Ganymede
When a comet comes close to the Sun, its volatile ice sublimates and transforms
directly from the solid to ________ phase.
crystalline
ionized
liquid
gas
gas
Each season is 42 years long on Uranus because
