31.The Virgo clusterA.is the galactic cluster that contains the Milky : 1777265
31.The Virgo cluster
A.is the galactic cluster that contains the Milky Way.
B.is the oldest known cluster of galaxies.
C.is located at the center of the universe.
D.contains mostly spiral galaxies and very few elliptical galaxies.
E.is a rich cluster and the closest cluster of galaxies outside of the Local Group.
32.Supermassive black holes are believed to be located at the center of many galaxies because
A.the rotation curve of the galaxy indicates that 90% of the galaxy is dark matter.
B.the orbital motion of material near the center is very fast and indicates a very massive core.
C.the shape of the bulge in all spiral galaxies can only be supported by a supermassive black hole.
D.the spiral structure requires a black hole to maintain the spiral arms.
E.the orbital speeds of a globular clusters in the galaxy are greater than the speed of light.
33.If H equals 70 km/sec/Mpc, then a galaxy with a radial velocity of 2100 km/sec has a distance of approximately
34.If a galaxy has a radial velocity of 8000 km/sec and the Hubble constant is 70 km/sec/Mpc, what is the distance to this galaxy?
A.8.75 ´ 103 Mpc
B.2.4 ´ 109 Mpc
C.5.6 ´ 105 Mpc
E.8.75 ´ 10-3 Mpc
35.If the absolute magnitude, M, of a supernova is -19 and a galaxy is found that contains a supernova with an apparent magnitude, m, of 16. What is the distance to the galaxy? Hint: dpc = 10(m - M + 5)/5 using a scientific calculator.
36.If Galaxy A is found to have a recessional velocity four times greater than Galaxy B, what can you say about their relative distances from Earth?
A.Galaxy A is four times closer than Galaxy B.
B.Galaxy A is four times further away than Galaxy B.
C.Galaxy A is twice as distant than Galaxy B.
D.Galaxy A is twice as close than Galaxy B.
37.Which of the following is the largest object?
A.The Milky Way galaxy.
B.The Large Magellanic Cloud.
C.The Local Group.
D.The Andromeda galaxy.
38.What is the Hubble constant essentially a measure of?
A.The number of galaxies in the universe.
B.The expansion of the universe.
C.The age of the Milky Way galaxy.
D.The amount of dark matter in an average galaxy.
39.What factors are important when trying to classify a spiral galaxy?
A.Amount of dust and gas in the galaxy
B.Structure of the spiral arms
C.Size of the central region
D.All of the above
40.What is the primary factor in determining the classification for an elliptical galaxy?