Astronomy current events question: early galaxy dark matter

Astronomy 210L, spring semester 2017
Cuesta College, San Luis Obispo, CA

Students are assigned to read online articles on current astronomy events, and take a short current events quiz during the first 10 minutes of lab. (This motivates students to show up promptly to lab, as the time cut-off for the quiz is strictly enforced!)
Reinhard Genzel, Natascha M. Förster Schreiber, Hannelore Hämmerle, "Event Horizon Telescope Ready to Image Black Hole" (March 16, 2017)
Very distant, early galaxies may have less dark matter than current galaxies, based on mapping the distribution of their stars':
(A) orbital velocities.
(B) brightness fluctuations.
(C) matter-antimatter ratios.
(D) neutrino emissions.
(E) fast radio bursts.

Correct answer: (A)

Student responses
Sections 30679, 30680
(A) : 10 students
(B) : 9 students
(C) : 8 students
(D) : 6 students
(E) : 0 students

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