1. As matter streams into a black hole it usually forms what kind of structure a
ID: 2106051 • Letter: 1
Question
1. As matter streams into a black hole it usually forms what kind of structure
a) accretion disk, b) spherical shell, c) a dark nebula, d) star formation region
2. . Which of these objects are not found in the Galactic Halo?
a) RR Lyrae variables ,b) globular clusters,c) emission nebulae ,d) stars with comet-like orbits
3. How do we know that the quasars are at large distances?
a) they are extremely dim, b) they have large redshifts,
c) they have large parallaxes, d) they are greatly obscured by interstellar dust
4. A tight, spherical collection of as many as several hundred thousand stars is a
a) Galaxy, b) globular cluster, c) open cluster, d) Einstein's cluster
5. An Einstein ring is a
a) group of galaxies which forms a ring in inter-galactic space
b) something Al gave to his mother
c) the theory that says the universe is a continuous ring of space time
d) distortion of an image due to gravitational effects
6. Why don’t we see quasars in our local neighborhood?
a) most quasars happened a long time ago so they are distant
b) there is no room for quasars in our local neighborhood
c) we must wait for their light to e red shifted first
d) the gas and dust from out own galaxy keeps us from seeing them
7. Our galaxy has two smaller galaxies in orbit around it which are called
a) A and B galaxies, b) polar galaxies, c) red and blue shifts galaxies, d) Magellanic clouds
8. If a galaxy is determined to be 2 million light years away, what does that mean
a) it takes light 2 million years to cross the galaxy
b) stars did not turn on till about 2 million years ago
c) it takes light 2 million years to reach us from the galaxy
d) if we could put our galaxy 2 million light years away it would look as bright as that galaxy.
9. The size of our galaxy is about
a) 3 light years, b) 100 thousand light years, c) one mega parsec, d) unknown at the present
10. About how long does it take for the Sun to complete one trip around the galaxy?
a) 25 thousand years, b) 2.5 million years, c) 250 million years, d) 25 billion years
11. . What observation of the Galaxy suggests it is much larger than the halo and contains a large amount of matter not in the form of stars?
a) The rotation curve, b) Motions of the globular clusters
12.. A primary difference between spiral and elliptical galaxies is
a) all ellipticals are more massive than spirals
b) ellipticals have more extensive interstellar media than spirals
c) star formation has ceased in ellipticals, but not in spirals
d) spirals have more stars than ellipticals
13.We can best see the spiral structure of our own galaxy by looking in which part of the spectrum?
a) infrared, b) visible, c) radio, d) x-ray
14.What kind of galaxy do we live in?
a) Spiral, b) elliptical, c) spherical, d) irregular
15. The very rapid orbital speed detected near the center of our galaxy suggests that
a) our galaxy has a lot of stored angular momentum, b) massive stars are at the center
c) a black hole is at the center, d) we have been in a collision in the past
16.The visual astronomer who cataloged nuisance nebulae was
a) Galileo, b) Einstein, c) Messier, d) Hubble
17.
a) the number of stars, b) the rotation curve, c) number of pulsars, d) how thick a galaxy is
18.What type of galaxy is the Andromeda galaxy M31)?
a) spiral, b) globular, c) elliptical, d) irregular
19.Hubble’s law states that:
a) putting telescopes in space will cost approximately ten times more than ground based telescopes
b) the recession of one galaxy must equal the precession of another
c) the faster a galaxy moves away from us the more massive it is
20.An Einstein ring is a
a) group of galaxies which forms a ring in inter-galactic space
b) something Al gave to his mother
c) the theory that say the universe is a continuous ring of space time
d) distortion of an image due to gravitational effects
21. The Magellanic clouds are
a) regions of star formation in the Andromeda galaxy
b) close clusters of galaxies about 10 megaparsecs away
c) nearby irregular galaxies gravitationally bound to the Milky Way
d) an optical illusion caused by dust in the interplanetary medium
22.Which of the following is not a characteristic of the stars of the disk component of our galaxy?
a. circular orbits, b. randomly inclined orbits, c. higher metal abundance, d. young stars
23.As matter streams into a black hole it usually forms what kind of structure
a) accretion disk, b) spherical shell, c) a dark nebula, d) star formation region
24.What is the easiest way to find the distance to a galaxy
a) Pallardy’s Law, b) Newton’s Laws, c) Einstein’s Law, d) Hubble’s Law
25.What causes Cepheid variables to vary in brightness?
a) they pulsate, b) eclipses,
c) changes in nuclear energy generation rate, d) obscuration by clouds of dust
26.. The region between stars is:
a) empty, the stars have accreted all the mater, b) filled mostly with gas and dust
c) composed of dark nebulae, d) filled with emission nebulae
27.In the future our Milky Way galaxy will collide with what other galaxy?
a) small Magellanic cloud, b) large Magellanic cloud, c) Andromeda, d) Cepheid
28.. If our galaxy has a black hole in the center, why don’t we see jets being emitted?
Explanation / Answer
1. black hole
3. they have large redshifts
4. galaxy
5.distortion of an image due to gravitational effects
6.)Â most quasars happened a long time ago so they are distant
7. Magellanic clouds
8. it takes light 2 million years to reach us from the galaxy
9. 100 thousand light years,
10. Â 250 million years
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