Question 1

Distinguish an Sa from an Sc galaxy.

Accepted Answer

The answer of Distinguish an Sa from an Sc galaxy....

Question 2

Distinguish an E0 from an E7 galaxy.

Accepted Answer

The answer of Distinguish an E0 from an E7 galaxy....

Question 3

The greatest variation in size, mass, and luminosity occurs in

Accepted Answer

A)  spiral and barred spiral galaxies. 
B)  elliptical galaxies. 
C)  Irr I vs. Irr II galaxies. 
D)  Seyfert galaxies. 
E)  globular clusters.

Question 4

For a galaxy 200 Mpc away, a useful standard candle would be the .

Accepted Answer

The answer of For a galaxy 200 Mpc away, a...

Question 5

Space itself is expanding.

Accepted Answer

A) True 
 B)False

Question 6

In Hubble's "tuning fork," spirals are on the parallel branches.

Accepted Answer

A) True 
 B)False

Question 7

The Local Group consists of about _ galaxies.

Accepted Answer

The answer of The Local Group consists of about _...

Question 8

According to Hubble's Law, a galaxy with a recession velocity of 25,000 km/s will be

Accepted Answer

A)  700 million pcs away. 
B)  400 million pcs away. 
C)  100 million pcs away. 
D)  1000 million pcs away. 
E)  less than 1 million pcs away.

Question 9

The Virgo Cluster of galaxies is not much larger in size than the Local Group, but it does contain far more galaxies.

Accepted Answer

A) True 
 B)False

Question 10

What type of galaxy are the two Magellanic Clouds? How do we know this visually?

Accepted Answer

The answer of What type of galaxy are the two...

Question 11

The dustiest and flattest spiral galaxies are in Hubble's class

Accepted Answer

A)  Sa. 
B)  SBa. 
C)  SBc. 
D)  S0. 
E)  Sc.

Question 12

How did Hubble use the cosmological redshift to determine distance?

Accepted Answer

The answer of How did Hubble use the cosmological redshift...

Question 13

The flattest of the ellipticals are class

Accepted Answer

A)  E9. 
B)  SBO. 
C)  E0. 
D)  E7. 
E)  SBF.

Question 14

The astronomer who originally classified galaxies into S, E, and Irr was

Accepted Answer

A)  William Herschel. 
B)  Edwin Hubble. 
C)  Henrietta Leavitt. 
D)  Harlow Shapley. 
E)  Carl Sagan.

Question 15

Why does the Cepheid distance method fail us beyond about 20 Mpc?

Accepted Answer

A)  The intergalactic dust reddens the Cepheid's light and apparent brightness. 
B)  Distant galaxies are seen in the past, and Cepheids evolve with time. 
C)  The periods of Cepheids grows longer as the distances increase. 
D)  Distant galaxies are younger than our Milky Way; too young to have Cepheids yet. 
E)  Even with the HST, the most luminous Cepheids are too faint to be seen beyond 20 Mpc.

Question 16

What is the Tully- Fisher relation?

Accepted Answer

The answer of What is the Tully- Fisher relation?...

Question 17

The central engine for active galaxies is believed to be a(n) .

Accepted Answer

The answer of The central engine for active galaxies is...

Question 18

Seyferts are spirals with quasar- like nuclei.

Accepted Answer

A) True 
 B)False

Question 19

Which of the following is NOT one of Hubble's types of galaxies?

Accepted Answer

A)  Seyfert spirals 
B)  dwarf ellipticals 
C)  barrel spirals 
D)  normal spirals 
E)  irregular type II

Question 20

On what basis are we sure that no quasar is lurking among the thousands of member galaxies in the Virgo Cluster, 18 Mpc distant?

Accepted Answer

The answer of On what basis are we sure that...

Exam 16: Normal and Active Galaxies: Building Blocks of the Universe

Distinguish an Sa from an Sc galaxy.

Distinguish an E0 from an E7 galaxy.

The greatest variation in size, mass, and luminosity occurs in

For a galaxy 200 Mpc away, a useful standard candle would be the .

Space itself is expanding.

In Hubble's "tuning fork," spirals are on the parallel branches.

The Local Group consists of about _ galaxies.

According to Hubble's Law, a galaxy with a recession velocity of 25,000 km/s will be

The Virgo Cluster of galaxies is not much larger in size than the Local Group, but it does contain far more galaxies.

What type of galaxy are the two Magellanic Clouds? How do we know this visually?

The dustiest and flattest spiral galaxies are in Hubble's class

How did Hubble use the cosmological redshift to determine distance?

The flattest of the ellipticals are class

The astronomer who originally classified galaxies into S, E, and Irr was

Why does the Cepheid distance method fail us beyond about 20 Mpc?

What is the Tully- Fisher relation?

The central engine for active galaxies is believed to be a(n) .

Seyferts are spirals with quasar- like nuclei.

Which of the following is NOT one of Hubble's types of galaxies?

On what basis are we sure that no quasar is lurking among the thousands of member galaxies in the Virgo Cluster, 18 Mpc distant?