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AST 111 Exam (A Graded) | Questions with Verified Answers
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AST 111 Exam (A Graded) | Questions with Verified Answers
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AST 111 Exam (A Graded) | Questions withVerified Answers
When Jocelyn Bell discovered the first pulsar, it was jokingly called an "LGM" for "little green
men." What key piece of evidence suggested instead that the pulsar was the remains of a
collapsed stellar core? - ✔✔Pulsars were found to be located at the centers of supernova
remnants.
Once scientists concluded that pulsars were the remains of collapsed stellar cores, what key
modeling evidence led scientists to conclude that they must be neutron stars rather than white
dwarfs? - ✔✔Pulsars rotate so rapidly that if they were white dwarfs, they would be torn
apart.
Why do disk stars bob up and down as they orbit the galaxy? - ✔✔because the gravity of
other disk stars always pulls them toward the disk
Which part of the galaxy has gas with the hottest average temperature? - ✔✔the halo
Which part of the galaxy contains the coldest gas? - ✔✔the disk
The circular but relatively flat portion of the galaxy is the__________. - ✔✔disk
The first portion of the galaxy to form was the_________. - ✔✔halo
A tightly packed group of a few hundred thousand very old stars is a_________. -
✔✔globular cluster
A ________ out in a photo of a galaxy because it shines brightly with light from massive young
stars and glowing clouds of gas and dust.stands out in a photo of a galaxy because it shines
,brightly with light from massive young stars and glowing clouds of gas and dust. - ✔✔spiral
arm
Our milky way galaxy is a________. - ✔✔spiral galaxy
Stars orbiting in the near the _______ center can have orbits highly inclined to the galactic
plane. - ✔✔bulge
Where are most of the Milky Way's globular clusters found? - ✔✔In the halo
How do we determine the Milky Way's mass outside the Sun's orbit? - ✔✔from the orbits of
stars and gas clouds orbiting the galactic center at greater distances than the Sun
Where would you least expect to find an ionization nebula? - ✔✔In the halo
The best measurements of the mass of the black hole at the galactic center come from -
✔✔the orbits of stars in the galactic center
The following figures show several stars found in the disk and halo of the Milky Way Galaxy.
Rank the stars based on their current age, from oldest to youngest. If two (or more) stars have
approximately the same age (that is, ages within a few million years), rank them as equal by
dragging one on top of the other(s).
hot blue main sequence star in disk, our sun, red main sequence star in globular cluster M13,
Red giant in globular cluster M13 - ✔✔red main sequence star in globular cluster M13 + red
giant in globular cluster M13 < overlap, the sun, hot blue main sequence star in disk
Listed following are several stars found in the disk and halo of the Milky Way Galaxy. Assume
that both the blue and yellow disk stars are members of the same open cluster. Rank the stars
based on the abundance of elements heavier than carbon that you would expect to find in each
of the stars, from highest to lowest. If you expect two (or more) stars to have approximately the
same abundance, rank them as equal by dragging one on top of the other(s).
, hot blue main sequence star in open cluster in disk, yellow main sequence star in open cluster
in disk, red main sequence star in globular cluster M13, Red giant in globular cluster M13 -
✔✔hot blue main sequence star in open cluster in disk + yellow main sequence star in open
cluster in disk < over lap, red main sequence star in globular cluster M13 + Red giant in globular
cluster M13 < over lap
the following statements correctly summarize key differences between the disk and the halo -
✔✔-Clusters of young stars are found only in the disk.
-Disk stars come in a broad range of masses and colors, while halo stars are mostly of low mass
and red.
-Gas and dust are abundant in the disk but not in the halo.
-Stars in the disk all orbit in the same direction and nearly the same plane, while halo stars have
more randomly oriented orbits.
Listed following are several locations in the Milky Way Galaxy. Rank these locations based on
their distance from the center of the Milky Way Galaxy, from farthest to closest.a globular
cluster in the outskirts of the halo,the edge of the central bulge, a cloud of gas and dust
in the outskirts of the disk, our solar system - ✔✔a globular cluster in the outskirts of the
halo, a cloud of gas and dust in the outskirts of the disk, our solar system, the edge of the
central buldge
Imagine a photon of light traveling the different paths in the Milky Way described in the
following list. Rank the paths based on how much time the photon takes to complete each
journey, from longest to shortest.
across the diameter of the galactic halo,from the Sun to the
center of the galaxy, across the diameter of the galactic disk, across the diameter of the central
bulge, through the disk from top to bottom - ✔✔across the diameter of the galactic halo,
across the diameter of the galactic disk, from the Sun to the
center of the galaxy, across the diameter of the central bulge, through the disk from top to
bottom
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