How are rotation curves of spiral galaxies determined for distances beyond where starlight can be detected?
A) by extrapolation of the measured rotation curve
B) by observations of the 21 cm line of atomic hydrogen
C) by observations of spectral lines emitted by dark matter
D) by watching the galaxies rotate over a period of decades
E) by measuring the broadening of the galaxy's absorption lines
Correct Answer:
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Q1: What are peculiar velocities?
A) velocities perpendicular to
Q2: Which of the following particles are baryons?
A)
Q4: A gravitational lens occurs when
A) a massive
Q5: Why do we call dark matter "dark"?
A)It
Q6: A mass-to-light ratio for a galaxy of
Q7: Why do we expect WIMPs to be
Q8: Which of the following are candidates for
Q9: Which of the following is not evidence
Q11: How do we determine the amount of
Q30: Which of the following is an example
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