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ASTR 1020 FINAL EXAM NEWEST ACTUAL EXAM COMPLETE ALL 150 QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+ $28.49
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ASTR 1020 FINAL EXAM NEWEST 2024-2025 ACTUAL
EXAM COMPLETE ALL 150 QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) |ALREADY GRADED A+
Evidence of a supermassive black hole at the center of the Milky
Way comes from - ANSWER- strong radio emission from the
region of the accretion disk, direct observations of stars that
orbit it, X-rays from material that is falling in.
Why is the Andromeda Galaxy now moving toward us? -
ANSWER- This is due to the mutual gravitational attraction
between the Milky Way and Andromeda galaxies.
The Large Magellanic Cloud and Small Magellanic Cloud will
likely - ANSWER- become part of the milky way
According to the article, astronomers analyzed the speed of stars
at the edges of the Milky Way to estimate the mass of dark
matter. Where would these stars fit on the graph shown of
,2|Page
rotation velocities at distances from the galactic center? -
ANSWER- off the graph to the right
The article's mass estimate of dark matter is about __________
the mass of our galaxy inside the Sun's orbit. - ANSWER- 8.6
times
Where is this additional dark matter mass located? - ANSWER-
distributed throughout the entire galaxy and its halo
How does this new estimate of the mass of the Milky Way affect
the calculation of the escape velocity from our galaxy? -
ANSWER- The escape velocity from the galaxy is less than
previously estimated.
What measurements would allow you to determine each cluster's
distance from us - ANSWER- the period and apparent
brightness of RR Lyraes in each cluster
How did dust affect Shapley's RR Lyrae measurements? -
ANSWER- The apparent brightnesses were fainter than they
would be if there were no dust.
, 3|Page
The galaxy is moving away from Earth - ANSWER- at a high
velocity
How do galaxies appear to move based on this graph? -
ANSWER- Most are moving away from us, with more distant
galaxies moving, on average, more quickly away from us
Which of the following statements regarding the expansion of
the universe are correct? - ANSWER- More distant galaxies
appear to be moving more quickly away from any particular
galaxy than those that are closer to that galaxy.
From the vantage point of each galaxy, most other galaxies will
appear to be moving away
How will this affect light according to how long it has been
traveling through this expanding space? - ANSWER- The longer
the light has been traveling, the more strongly redshifted it will
be.
How would the light we observe on Earth from a high-redshift
galaxy compare to the light observed from a low-redshift
galaxy? - ANSWER- We will see the high-redshift galaxy as it
was earlier in time than the low-redshift galaxy.
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