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38 Cards in this Set

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The part of the Milky Way we are most familiar with is the:
A) Galactic Disk.
B) Halo.
C) Galactic Bulge.
D) Corona.
E) Galactic Center.
A) Galactic Disk.
Most of the new star formation in the Milky Way Galaxy is found in the
A) bulge
B) halo
C) galactic center
D) globular clusters
E) spiral arms
E) spiral arms
Detailed measurements of the disk and central bulge region of our galaxy suggest that our Milky Way is a(n)
A) dusty irregular galaxy
B) barred spiral galaxy
C) active galaxy
D) Seyfert galaxy
E) very flat elliptical galaxy
B) barred spiral galaxy
It was the distribution of ________ that showed Harlow Shapley we were no where near the center of the Milky Way in the 1920s.
A) globular clusters
B) supernova remnants
C) open clusters
D) emission nebulae
E) planetary nebulae
A) globular clusters
For what type of object is the period-luminosity relation used for determining distances?
A) Cepheids
B) RR Lyrae variables
C) Planetary nebulae
D) T Tauri variables
E) Cataclysmic variables
A) Cepheids
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) motions of the globular clusters
B) infrared observations of the center of the Galaxy
C) the shape of the spiral arms
D) tidal streams in the halo
E) the rotation curve
E) the rotation curve
Which of the following is not typical of the Galaxy's spiral arms?
A) emission nebulae
B) globular clusters
C) OB associations
D) giant molecular clouds
E) young star clusters
B) globular clusters
An intermediately wound barred spiral galaxy would, in Hubble's system, be:
A) S2B.
B) BSE.5.
C) SBb.
D) BS2.
E) SIrr.
C) SBb.
The greatest variation in size and mass occurs in which type of galaxy?
A) Irr I
B) Irr II
C) SB
D) E
E) Sc
D) E
Most galaxies in the Local Group are:
A) larger spirals than either the Milky Way or M-31 in Andromeda.
B) brown dwarfs, with even more dust than our own Galaxy.
C) dwarf ellipticals, similar to the companions of M-31.
D) small irregulars similar to the Magellanic Clouds.
E) dwarf spirals.
C) dwarf ellipticals, similar to the companions of M-31.
Which of the following paraphrases Hubble Law?
A) The more distant a galaxy is, the younger it appears.
B) The greater the distance to a galaxy, the fainter it is.
C) The older the galaxy appears to us, the more luminous it is.
D) The faster the galaxy spins, the more massive and luminous it is.
E) The greater the distance to a galaxy, the greater its redshift.
E) The greater the distance to a galaxy, the greater its redshift.
In active galaxies, the central engines may be temporarily fed by
A) the sudden collapse of the core into a supermassive black hole.
B) the fusion of helium into carbon in their cores.
C) a close encounter with a neighbor galaxy.
D) a series of supernovae around the core.
E) a sudden surge of star formation.
C) a close encounter with a neighbor galaxy.
The most elongated of the elliptical galaxies are Hubble's class:
A) SBE9.
B) E7.
C) F2.
D) E9.
E) SE5.
B) E7.
The Magellanic Clouds are:
A) the brightest H II regions in the sky, with active star formation.
B) spiral nebulae originally described by William Herschel.
C) small irregular galaxies that move in orbit around our Milky Way.
D) dust clouds in the southern Milky Way near the Southern Cross.
E) the nearest of the globular star clusters.
C) small irregular galaxies that move in orbit around our Milky Way.
A galaxy seen 1 billion light-years away means we see it
a) as it was when the universe was 1 billion years old.
b) as it will be 1 billion years from now.
c) as it was 1 billion years ago.
d) as it is today, but redshifted 10 percent of the speed of light.
e) as it was just after the Big Bang.
c) as it was 1 billion years ago.
Based on galactic rotation curves and motions in clusters of galaxies, dark matter
makes up about 90 percent of the matter in the universe
collisions between galaxies
cause gas and dust clouds to collide leading to rapid star formation
when spiral galaxies collide the greatest impact occurs on their giant molecular clouds
their giant molecular clouds
due to the density and collisions among galaxies, _______ are rare in the center of clusters
spirals
the large-scale distribution of galaxies in the universe reveals
Large voids, with most of the galaxies lying in filaments and sheets
the rapid variation of brightness of quasars indicates
the source of energy is very small
the lensing of a distant quasar is produced in a foreground galaxy by its
total mass of stars, gas, and dark matter
Which type of galaxy can grow to the greatest mass and possess the largest number of globular clusters?
elliptical
How do we get Doppler velocity independent distances to more distant galaxies
-Period-luminosity
You see distant b-type star like rigel in
2 & 3
Most galaxies (99%) are
Rushing away from us
Galaxy distance and Doppler red shift are correlated for galaxies, what is this called
Hubble law
What is the H in V=Hr
hubble constant
We estimate the value of H by getting what measure for many galaxies at different
distance
How would we get Doppler velocity independent distance to the nearest galaxies.
comparing brightest stars/clusters/nebulae with similar objects in MW
The period-luminosity relationship is a crucial component of
measuring distances with cepheid variable stars
21- cm radio radiation is useful in studying our galaxy because
it can be used to map out the cool hydrogen in spiral arms
in the formation of our galaxy
the globular clusters formed first
what suggests that the mass of our galaxy extends farther than its visible disk?
the rotation curve of the outer edges of the galaxy
The leading explanation for the existence of spiral arms are
the spiral density waves through interstellar medium
star formation ceased first in the
Halo
What two observations allow us to estimate the galaxies mass
the orbital period and distance from the center
How did Hubble prove that the andromeda nebula was infact an external galaxy
He found cepheids in the Nebula