SMT 314 - Introduction to Cosmology » Fall 2020 » HW 16

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Question #1
By using the method of gravitational lensing, we can measure the total mass (light matter + dark matter) of the lensing object
A.   FALSE
B.   TRUE
Question #2
Dark matter is thought to consist of WIMPs; it is not the "normal" matter composed of neutrons, protons, & electrons.
A.   TRUE
B.   FALSE
Question #3
Giant "voids" in the Universe are the result of enormous explosions that blew matter out of those regions.
A.   FALSE
B.   TRUE
Question #4
High-redshift arcs around clusters of galaxies at low redshifts are now thought to be examples of gravitational lensing.
A.   TRUE
B.   FALSE
Question #5
Usually, elliptical galaxies contain only relatively young stars; there are no ancient stars anywhere within them.
A.   TRUE
B.   FALSE
Question #6
Distant galaxies have large ___________ times, allowing us to study the evolution of galaxies.
A.   lookback
B.   sequence
C.   rotation
D.   transition
Question #7
Galaxies move about the center of mass of their supercluster, sometimes merging due to:
A.   supernova explosions
B.   gravity
C.   gas & dust
D.   ignition
Question #8
Structure of the Universe: 2dF and the Sloan Microwave Digital Survey plotted clusters of galaxies. What kind of structure was seen among super-clusters of galaxies?
A.   Filaments of galaxies surround voids that have no or very few galaxies inside.
B.   Each cluster of galaxies is the same size.
C.   Super-clusters are uniform & homogeneous across the universe.
D.   Super-clusters expand outward from a Big Bang source.
Question #9
Planetary orbits about the Sun have slower orbital speed far from the Sun. The rotation curve of our galaxy suggests that orbital speed is constant along the spiral arms. To understand the role of gravity, it has been proposed that our Galaxy has mass at great distances from the galactic center. What does the text identify makes up most of that mass?
A.   dark energy
B.   stars, protons, neutrons, electrons
C.   none of these
D.   dark matter
Question #10
Which one of the following statements about galaxy evolution is false?
A.   At least some galaxies formed from the joining together (merging) of small groups of stars.
B.   Astronomers can learn about the evolution of galaxies with images of the same galaxies taken by Edwin Hubble in the early 20th century.
C.   Most elliptical galaxies formed within the first few billion years after the big bang.
D.   In the past, there existed a population of small, blue, irregular galaxies that have either merged together or faded from view.
E.   Our Milky Way Galaxy and the Andromeda Galaxy are likely to form an elliptical galaxy at some time in the future.
Question #11
Which one of the following statements about the expanding Universe and Hubble's law (v = Hod) is false?
A.   Hubble's law can be used to determine the lookback times of distant galaxies - that is, how far back in time we are seeing them.
B.   If Galaxies Luke and Yoda both satisfy Hubble's law, and Galaxy Luke's distance is three times Galaxy Yoda's distance, then Galaxy Luke is moving away from us three times faster than Galaxy Yoda.
C.   Hubble's law alone implies that as the distance of a particular galaxy increases with time, it moves away from us progressively faster; in other words, it's accelerating away from us.
D.   Despite the expansion of the Universe, pairs of galaxies can still sometimes move toward each other and even merge together.

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