LATEST ASTR 1020 EXAM / ASTR 1020 ACTUAL FINAL
EXAM NEWEST COMPLETE REAL QUESTIONS AND
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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
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.
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
The length of time that it takes for the light from the outburst to pass the observer
indicates - ANSWER: the size of the AGN
Given that Shapley calculated the size of the Milky Way based on the stars' apparent
brightness, how did not including the effects of gas and dust affect Shapley's
calculation? - ANSWER: The distance calculated to each globular cluster was too
large, and thus his size for the Milky Way was too large.
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