Astro 1 PSU Exam QUESTIONS WITH COMPLETE SOLUTIONS
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Astro 1 PSU
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Astro 1 PSU
Astro 1 PSU Exam QUESTIONS WITH COMPLETE SOLUTIONS
Which is the smallest object? - CORRECT ANSWER -A neutron star
A galaxy has an H-alpha emission line observed at a wavelength 10 percent larger than the rest wavelength of H-alpha. What is the redshift of the galaxy? - CORRECT AN...
Astro 1 PSU Exam 4 2024-2025 QUESTIONS
WITH COMPLETE SOLUTIONS
Which is the smallest object? - CORRECT ANSWER -A neutron star
A galaxy has an H-alpha emission line observed at a wavelength 10 percent larger than
the rest wavelength of H-alpha. What is the redshift of the galaxy? - CORRECT
ANSWER -0.1
What is in this image? - CORRECT ANSWER -Supernova remnant
Which is the most luminous? - CORRECT ANSWER -Quasar
Which contains the most stars? - CORRECT ANSWER -A spiral galaxy
Galaxy A appears twice the angular size of Galaxy B. Assuming the two galaxies have
the same physics size in kiloparsecs, which of the following is true? - CORRECT
ANSWER -Galaxy B is 2 times further away than Galaxy A
What fundamental particles make a Helium-3 atom? - CORRECT ANSWER -5 up
quarks, 4 down quarks, 2 electrons
What type of galaxy is in this image? - CORRECT ANSWER -SBc
Which statement is FALSE? - CORRECT ANSWER -Planetary nebulae usually have
black holes at their centers
,Astro 1 PSU Exam 4 2024-2025 QUESTIONS
WITH COMPLETE SOLUTIONS
Which statement is TRUE? - CORRECT ANSWER -Stars form in molecular clouds,
where temperatures are about 10 degrees Kelvin
How tiny a spot is the Hubble Deep Field? - CORRECT ANSWER -The size of
President Roosevelt's eye on a dime held at arm's length
Among these choices, what is the last thing that happens in the history of the Universe?
- CORRECT ANSWER -Electrons join with nuclei to make atoms
If a galaxy had no dark matter, we would observe ... - CORRECT ANSWER -The
rotation velocity would decrease with increasing distance like the Keplerian curve in our
Solar System
How many times bigger is the Local Group of galaxies in which the Milky Way resides
than the Milky Way itself? - CORRECT ANSWER -About 100 times bigger
Which one of the following is FALSE? - CORRECT ANSWER -Galaxy collisions destroy
most of the stars in the galaxies involved
If a galaxy is moving away from us the wavelength of the light it emits will be ... -
CORRECT ANSWER -Increased
If light takes 4 billion years to reach us from a distant galaxy, how many times farther
away is the distant galaxy than the Andromeda galaxy, which is 2 million
,Astro 1 PSU Exam 4 2024-2025 QUESTIONS
WITH COMPLETE SOLUTIONS
light years away? - CORRECT ANSWER -2,000 times
The stars in the halo of our Milky Way Galaxy are - CORRECT ANSWER -Older and
redder than those in the disk
The supermassive black hole in the center of the Milky Way has a mass of - CORRECT
ANSWER -4 million solar masses
Which force has as its boson the photon? - CORRECT ANSWER -Electromagnetic
Which mysterious phenomena do scientists attribute to dark energy? - CORRECT
ANSWER -The increasing rate of expansion of the Universe
Why can we NOT see back the whole way to the time the Big Bang expansion began? -
CORRECT ANSWER -The radiation scatters off matter frequently so the Universe is
opaque
What are the standard candles that were used to determine the Universe is accelerating?
- CORRECT ANSWER -Type Ia supernovae
An older star cluster ... - CORRECT ANSWER -Has a main sequence turnoff further
to the right on the H-R diagram
, Astro 1 PSU Exam 4 2024-2025 QUESTIONS
WITH COMPLETE SOLUTIONS
Which of the following statements is TRUE? - CORRECT ANSWER -Type II
supernovae are produced by the death of a massive star
Open Star Clusters - CORRECT ANSWER -Have hundreds, up to thousands, of stars
-The stars formed at about the same time, from the same initial gas & dust cloud
-Cluster only stars bound by gravity for a few million years
-Tend to have lots of blue stars visible, because of relatively young ages
-The "Pleiades" is a notable example
Globular Star Clusters - CORRECT ANSWER -Hundreds of thousands, to millions, of
stars
-Tend to be yellow in color, with a number of red giants
-Many have ages around 10 billion years — considered old
-An example picture of a globular cluster, "47 Tucanae
Ages of Star Clusters - CORRECT ANSWER -Ages of star clusters can be determined
by seeing what spectral class of star has
most recently "turned off" of the main sequence, in the cluster's H-R diagram
-Many stars formed in clusters that later dispersed, leaving stars more isolated
Planetary Nebulae - CORRECT ANSWER -A low-mass star runs out of core nuclear
fuel, blows off outer layers (recall Unit 3)
-Stars can pulsate and eject gas in layers
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