astronomy wk8 quiz pt2
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American Military University *
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180
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Astronomy
Date
Apr 3, 2024
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docx
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6
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Quasars are ________ times as bright as luminous elliptical galaxies.
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Quasars are much more common today than they were in the early stages of the Universe.
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Black hole masses are roughly __________ times the mass of their host galaxies.
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Today, fuel for a quasar most likely comes from which of the
following:
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s
the centers of galaxies
globular clusters
ions of O and B stars
Dark energy differs from dark matter in that in produces a repulsive force instead of an attractive force.
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Which formed first?
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i
s
When we observe galaxies with very large redshifts, all of the following are true except:
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at galaxies from close to the beginning of the universe.
farther back in time.
at galaxies that are more distant.
at the most massive galaxies in the universe.
The standard Big Bang theory of cosmology cannot account for the smoothness of the cosmic microwave background radiation.
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The critical density is the density at which the universe will implode.
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Why do all galaxies outside our Local Group show a redshift?
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We are in the center of the Universe.
We are moving away from those galaxies.
Light waves from those galaxies have been stretched by the stretching of spacetime.
Distant galaxies emit only red light.
Overall Grade
Which of the following is the most useful probe of the early evolution of the universe?
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galaxies
ies (like the LMC)
Which of the following apply to Quasars?
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nergy source
jets
ated areas
mely long timescales
ource
If there were no dark energy, the expansion of the universe would be:
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The brightest quasars will shine brightly forever.
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The expansion of the Universe is accelerating. Scientists explain this by conjecturing that dark energy must exist.
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Supermassive black holes are typically:
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masses
solar masses
0,000 solar masses
000,000,000 solar masses
Quasars are roughly the size of:
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em
y Galaxy
iptical galaxies
What is the current best value for the Hubble constant?
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c
c
c
c
Analysis of spectral lines in quasars indicates that:
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ain only hydrogen and helium.
eceding at extremely high speeds.
otating at very slow speeds.
star-like qualities, even though they are not stars.
Which of the following are possible futures for our Universe?
Question options:
closed universe
open universe
partial universe
empty universe
full universe
10 / 10 - 100 %
10 / 10 - 100 %
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