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ASTR 1020 FINAL EXAM LATEST 2024 WITH ACTUAL QUESTIONS AND CORRECT VERIFIED ANSWERS/ALREADY GRADED A+ 100% GUARANTEED TO PASS CONCEPTS(ALL WHAT YOU NEED) LATEST EDITION 2024$26.99
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ASTR 1020 FINAL EXAM LATEST 2024 WITH ACTUAL QUESTIONS AND CORRECT VERIFIED ANSWERS/ALREADY GRADED A+ 100% GUARANTEED TO PASS CONCEPTS(ALL WHAT YOU NEED) LATEST EDITION 2024
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Course
ASTR 1020
Institution
ASTR 1020
ASTR 1020 FINAL EXAM LATEST 2024 WITH ACTUAL
QUESTIONS AND CORRECT VERIFIED ANSWERS/ALREADY
GRADED A+ 100% GUARANTEED TO PASS CONCEPTS(ALL
WHAT YOU NEED) LATEST EDITION 2024
ASTR 1020 FINAL EXAM LATEST 2024 WITH ACTUAL
QUESTIONS AND CORRECT VERIFIED ANSWERS/ALREADY
GRADED A+ 100% GUARANTEED TO PASS CONCEPTS(ALL
WHAT YOU NEED) LATEST EDITION 2024
On the basis of the colors and lifetimes of different types of stars, which of the
following statements best describes the current state of the bulge and disk? -
ANSWER-New stars are forming mostly in the disk.
choose the statement that best describes why there is more star formation in
the disk. - ANSWER-There is more cold, dense gas in the disk than in the bulge
which of the following most accurately describes the spiral arms? - ANSWER-
The stars move in and out of the arms while they rotate around the galaxy
center.
What effect would you expect this (spiral arms) to have on stars? - ANSWER-
There will be more star formation inside the spiral arms
Think about what you have learned about stars and galaxies so far, and
determine which of the following statements is correct.
Choose one:
A. Both red and blue stars form inside the spiral arms. Then the red stars move
out of the arms, while the blue stars stay inside them.
,B. Both red and blue stars form everywhere equally within the disk of the
galaxy, then something happens to clear the blue stars out from in between the
arms.
C. Both red and blue stars form inside the spiral arms. Then both stars begin to
move out of the arms, but the blue stars die before they can get very far.
D. Red stars form in between the spiral arms, whereas blue stars form inside
them. - ANSWER-C
Based purely on your observations of this plot, which of the following
statements best describes the visible distribution of mass within that galaxy? -
ANSWER-The highest concentration of mass is in the center of the galaxy, and it
decreases with increasing distance from the center.
Owing purely to the effects of the gravitational force between individual
galaxies, which of the following should be true? - ANSWER-Some galaxies
should be moving towards the Milky Way, and others should be moving away
from it.
Based on what you have learned in previous chapters, which of the following
measurements would we use to determine which galaxies are moving toward
or away from the Milky Way? - ANSWER-The Doppler Shift of spectral lines
within the galaxies spectrum.
Given that elliptical galaxies are relatively round, ranging in shape from spheres
to more squished spheroids similar to an American football, which of the
following statements most accurately describes the orbits of stars in an
elliptical galaxy? - ANSWER-The stars all have irregular orbits in all directions
around the center
Considering how the predictions compare to the observations, what does this
imply about the mass distributed in the galaxy? - ANSWER-The observations
show higher velocities than is predicted, mostly in the outer regions of the
galaxy, indicating that there is more mass in the outer regions than we can see.
, An elliptical galaxy may appear round if - ANSWER-it has one axis shorter than
the other two but is viewed parallel to the short axis, all three axes are the
same; it is spherical in shape, all three axes are different lengths, but it is
viewed from a special angle, and it is elongated along one axis, but it is viewed
parallel to the long axis.
When viewed edge on, a spiral galaxy often - ANSWER-has a dark line across
the middle
Hubble's law was discovered using measurements of two properties of a
galaxy: - ANSWER-distance and recession velocity
Which plot most closely matches the observed rotation curve of spiral galaxies?
- ANSWER-Increase peak then levels out
Astronomers know that dark matter is present in galactic halos because the
speeds of orbiting stars _________ far from the center of the galaxy. -
ANSWER-remain about contant
What contributes the largest percentage of total mass of a spiral galaxy? -
ANSWER-dark matter
All the light in an AGN outburst is emitted - ANSWER-At the same time
All the light in an AGN outburst travels - ANSWER-at the same speed
An observer finds out about an AGN outburst when - ANSWER-light emitted
from the closest part of the AGN arrives
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