WorksheetsGalaxies 2022
Total questions: 20
Worksheet time: 20mins
Name
Class
Date
1.
1) Most of the new star formation in the Galaxy is found in the:
a)
A) Globular clusters.
b)
B) Galactic bulge.
c)
C) Galactic halo.
d)
D) Galactic center.
e)
E) spiral arms.
2.
2) Most active galactic nuclei are powered by:
a)
A) supermassive black holes.
b)
B) mergers of compact objects.
c)
C) extra-terrestrial civilizations.
d)
D) a large number of supernovae.
e)
E) black hole mergers.
3.
3) The part of the Milky Way we are most familiar with is the:
a)
A) Galactic disk.
b)
B) Galactic bulge.
c)
C) Corona.
d)
D) Galactic center.
e)
E) Galactic halo.
4.
4) What is the nearest huge cluster of galaxies to our Local Group?
a)
A) Orion Nebula
b)
B) Coma Cluster
c)
C) Hercules Cluster
d)
D) Virgo Cluster
e)
E) Centaurus Cluster
5.
5) Density waves may explain:
a)
A) the large number of open clusters in the Galactic halo.
b)
B) the spiral arm structure of the Galaxy.
c)
C) the lack of blue stars in the Galactic halo.
d)
D) the density of red stars in the Galactic bulge.
e)
E) the random orbits of Galactic halo stars.
6.
6) For finding the distance to M31, Hubble relied upon:
a)
A) type II supernova in its spiral arms.
b)
B) type I supernova in its core.
c)
C) planetary nebulae near its core.
d)
D) Cepheid variables in its spiral arms.
e)
E) RR Lyrae stars in its globular clusters.
7.
7) Most galaxies in the Local Group are:
a)
A) dwarf spirals.
b)
B) small irregulars similar to the Magellanic Clouds.
c)
C) larger spirals than either the Milky Way or M-31 in Andromeda.
d)
D) brown dwarfs, with even more dust than our own Galaxy.
e)
E) dwarf ellipticals, similar to the companions of M-31.
8.
8) Which is the correct description of the Sun's location within the Milky Way?
a)
A) as Herschel found, very close to the Galactic center
b)
B) at the outer edge of the Galactic bulge but in the plane of the disk
c)
C) in the disk and about one-half a galactic radius from the center
d)
D) above the disk and about one-third of the galactic radius from the center
e)
E) in the disk but at its outer edge
9.
9) What two observations allow us to calculate the Galaxy's mass?
a)
A) the Sun's orbital velocity and its distance from the Galactic Center
b)
B) the Sun's mass and its age
c)
C) the Sun's age and period of the Galactic Year
d)
D) the Sun's composition and luminosity
e)
E) the Sun's mass and velocity in orbit of the Galactic Center
10.
10) Between us and the Galactic Center, the Milky Way has a mass of:
a)
A) 100 billion suns.
b)
B) one to two million suns.
c)
C) over a trillion suns.
d)
D) several hundred thousand suns.
e)
E) 250 million suns.
11.
11) Which of the following is NOT one of Hubble's types of galaxies?
a)
A) normal spirals
b)
B) barred spirals
c)
C) dwarf ellipticals
d)
D) Seyfert spirals
e)
E) irregular type II
12.
12) Detailed measurements of the disk and central bulge region of our Galaxy suggest our Milky Way is a:
a)
A) normal spiral galaxy.
b)
B) quasar.
c)
C) very dusty irregular galaxy.
d)
D) barred spiral galaxy.
e)
E) very flat elliptical galaxy.
13.
13) The gravitational microlensing technique has detected ________ in our Galactic halo.
a)
A) white dwarfs
b)
B) planets
c)
C) clouds of neutral hydrogen
d)
D) no visible matter
e)
E) red giants
14.
14) Although theory says a massive black hole with an accretion disk should be emitting X-rays, many black holes emit:
a)
A) only in the visible.
b)
B) mostly in the infrared.
c)
C) equally across the entire electromagnetic spectrum.
d)
D) mainly in the gamma.
e)
E) virtually no radiation at all.
15.
15) Which of the following paraphrases Hubble's Law?
a)
A) The more distant a galaxy is, the younger it appears.
b)
B) The greater the distance to a galaxy, the fainter it is.
c)
C) The older the galaxy appears to us, the more luminous it is.
d)
D) The faster the galaxy spins, the more massive and luminous it is.
e)
E) The greater the distance to a galaxy, the greater its redshift.
16.
16) From Earth, the view of the Milky Way is a thin band of stars across the night sky. The part of the Milky Way Galaxy that is described here is the:
a)
A) globular cluster.
b)
B) Galactic disk.
c)
C) spiral arm.
d)
D) Galactic bulge.
e)
E) Galactic halo.
17.
17) According to Hubble's Law, the greater a galaxy's redshift, the:
a)
A) greater its mass.
b)
B) closer it is to us.
c)
C) faster it's approaching us.
d)
D) younger it is.
e)
E) farther it is from us.
18.
18) Most of the mass of the Milky Way seems to exist in the form of:
a)
A) Population II stars in the halo.
b)
B) the black hole in the Galactic Center.
c)
C) Population I stars in the disk.
d)
D) hydrogen gas in the disk and spiral arms.
e)
E) dark matter out in the halo.
19.
19) The Milky Way is often considered to be an intermediately wound, barred spiral, which would be type ________ according to Hubble.
a)
A) SBV
b)
B) B2S
c)
C) Sa
d)
D) SBb
e)
E) E4
20.
20) The greatest variation in size, mass, and luminosity occurs in:
a)
A) Seyfert galaxies.
b)
B) elliptical galaxies.
c)
C) globular clusters.
d)
D) type I vs. type II irregulars.
e)
E) spiral and barred spiral galaxies.
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