Which of the following is not evidence for dark matter?
A) the flat rotation curves of spiral galaxies
B) the broadening of absorption lines in an elliptical galaxy's spectrum
C) X-ray observations of hot gas in galaxy clusters
D) gravitational lensing around galaxy clusters
E) the expansion of the universe
Correct Answer:
Verified
Q6: When we see that a spectral line
Q7: What is meant by "dark energy"?
A)the energy
Q8: If there is no dark matter in
Q9: Which of the following methods used to
Q10: Compared to the central regions of spiral
Q12: The distribution of the dark matter in
Q13: If a galaxy's overall mass-to-light ratio is
Q14: What evidence suggests that the Milky Way
Q15: Gravitational lensing occurs when
A)massive objects bend light
Q16: How do we know that there is
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