What fraction of the mass needed to halt expansion is known to exist in the form of visible mass in the universe?
A) 1 percent
B) 4 percent
C) 22 percent
D) 74 percent
E) 100 percent
Correct Answer:
Verified
Q19: A large mass-to-light ratio for a galaxy
Q20: Which of the following particles are baryons?
A)electrons
B)neutrinos
C)protons
D)quarks
E)photons
Q21: Based on current evidence concerning the amount
Q22: What do peculiar velocities reveal?
A)the amount of
Q23: Which of the following are candidates for
Q25: What is the evidence for an accelerating
Q26: What are peculiar velocities?
A)velocities perpendicular to our
Q27: If all the "dark matter" in the
Q28: Recent measurements of the expansion rate of
Q29: How do astronomers create three-dimensional maps of
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