Exam 2 more questions Flashcards
What is the name of the slightly cooler layer of the Sun just outside the photosphere?
Chromosphere
If the entire mass of Earth were concentrated in a region the size of a marble, the resulting object would be…
A black hole
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?
0.1
Which is the most luminous? A: nova B: supernova C: quasar D: the Sun E: white dwarf
Quasar
Which contains the most stars? A: an open star cluster B: a globular star cluster C: a spiral galaxy D: the Solar System E: the alpha Centauri star system
spiral galaxy
Galaxy A appears twice the size of galaxy B. assuming the two galaxies have the same physical size in kiloparsecs, which of the following is true?
A: Galaxy A is 2 times farther away than Galaxy B.
B: Galaxy B is 2 times farther away than Galaxy A.
C: Galaxy A and B are at the same distance.
D: Galaxy A is 4 times farther away than Galaxy B.
E: Galaxy B is 4 times farther away than Galaxy A.
Galaxy B is 2times farther than Galaxy A
Which statement is FALSE?
A: planetary nebulae can have layers because of pulsating stars
B: planetary nebulae usually last tens of thousands of years
C: a planetary nebula will be part of the end state of the Sun
D: planetary nebulae usually have black holes at their centers
E: planetary nebulae are a few light years in size
Planetary nebulae usually have black holes IS FALSE!
Which statement is TRUE?
A: Stars form in molecular clouds, where temperatures are about 10 Kelvin.
B: A cloud will collapse and form stars if its mass is a lot less than its Jeans mass.
C: A nova outburst typically only happens once in a star’s life.
D: Stars usually form in isolation, far away from other stars
E: The Crab supernova, in our galaxy, went off about 8 years ago.
Which statement is TRUE?
➔ A: Stars form in molecular clouds, where temperatures are about 10 Kelvin.
How tiny a spit is the Hubble Deep Field?
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?
A: electrons join with nuclei to make atoms
B: quarks join together to make protons and neutrons
C: nucleosynthesis
D: the Planck epoch
E: the Big Bang expansion begins
Electrons join with nuclei to make atoms
If a galaxy had no dark matter, we would observe…
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.
about 100 times bigger
Which of the following is false?
A: Irregular galaxies, although small, often have a lot of star formation taking
place in them.
B: Barred spiral galaxies have similar properties to normal spirals, except for
the “bar” feature.
C: Galaxy collisions destroy most of the stars in the galaxies involved.
D: Most galaxies appear to be receding from the Milky Way Galaxy.
E: Most elliptical galaxies contain only old stars.
Galaxy collisions destroy most of the stars in the galaxies involved IS FALSE!
If a galaxy is moving away from us the wavelength of the light it emits will be…
increased
The stars in the halo of our Milky Way Galaxy are…
older and redder than those in the disk
