Astro 102 Final Sets Questions With 100% Correct Answers | Latest Update
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Course
ASTR 102
Institution
ASTR 102
Astro 102 Final Sets Questions
With 100% Correct Answers |
Latest Update
What is the main reason that astronomers have devoted
many years of effort to determining the rotation curve for
the Milky Way galaxy - ANSWER : The rotation curve
can be used to help us determine the distribution o...
Astro 102 Final Sets Questions
With 100% Correct Answers |
Latest Update
What is the main reason that astronomers have devoted
many years of effort to determining the rotation curve for
the Milky Way galaxy - ANSWER ✔ : The rotation curve
can be used to help us determine the distribution of the
mass in the galaxy
How does the diameter of the disk of the Milky Way
compare to its thickness? - ANSWER ✔ : The diameter is
about 100 times greater than its thickness
The most common form of gas in the disk of the Milky
Way galaxy is - ANSWER ✔ : atomic Hydrogen gas
Which of the following statements is NOT true of the
object known as SGR A* in the center of our galaxy? -
ANSWER ✔ : Its accretion disk is so large that it shines
brightly in visible light
If you could watch a time-lapse movie of the interstellar
medium over hundreds of millions of years, what would
you see? - ANSWER ✔ : Gas that is often moving at high
speed, particularly after one or more supernovae, and
constantly changing form between molecular clouds,
,atomic hydrogen, and hot, ionized bubbles and
superbubbles.
Why are spiral arms bright? - ANSWER ✔ : Because
they contain more hot, young stars than other parts of the
disk
Why do we believe that most of the mass of the Milky
Way is in the form of dark matter? - ANSWER ✔ : The
orbital speeds of stars far from the galactic center are
surprisingly high, suggesting that these stars are feeling
gravitational effects from unseen mattter in the halo.
Red and orange stars are found evenly spread throughout
the galactic disk, but blue stars are typically found -
ANSWER ✔ : only near or in star-forming regions
All of the following types of objects are found almost
exclusively in the disk of the Milky Way except -
ANSWER ✔ : globular clusters
Applying the orbital velocity law to the a star orbiting
40,000 light-years from the center of the Milky Way galaxy
allows us to determine - ANSWER ✔ : the mass of the
Milky Way Galaxy that lies within 40,000 light-years of the
galactic center.
How would you expect a star that formed recently in the
disk of the galaxy to differ from one that formed early in
the history of the disk? - ANSWER ✔ : It should have a
, higher fraction of elements heavier than hydrogen and
helium
By observing the 300 stars nearest Earth, we know that
no star clusters have formed recently in our neighborhood
because - ANSWER ✔ : there are no nearby stars of
spectral type O or B
Which of the following statements about how halo stars
compare to our Sun is NOT true - ANSWER ✔ : Most
stars in the halo are in a more advanced stage of life than
the Sun, such as in red giant stage
How does the interstellar medium affect our view of most
of the galaxy - ANSWER ✔ : It prevents us from seeing
most of the galactic disk with visible, ultraviolet, and some
infrared light
Most nearby stars move relative to the Sun at speeds
below about 30 km/s. Suppose you observe a nearby star
that is moving much faster than this (say, 300 km/s).
Which of the following is a likely explanation for its high
speed? - ANSWER ✔ : It is probably a halo star that is
currently passing through the disk
How should we expect that the interstellar medium of the
Milky Way will be different in 50 billion years? - ANSWER
✔ : The total amount of gas will be much less than it is
today
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