Astronomy current events question: Triangulum II dwarf galaxy dark matter

Astronomy 210L, fall semester 2015
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!)

Lori Dajose, "Dark Matter Dominates in Nearby Dwarf Galaxy" (November 18, 2015)
caltech.edu/news/dark-matter-dominates-nearby-dwarf-galaxy-48790

Dark matter in the nearby Triangulum II dwarf galaxy was measured by observing its:
(A) heavy metals.
(B) stars' motions.
(C) pulsar timings.
(D) gamma ray emissions.
(E) neutrino decays.

Correct answer: (B)

Student responses
Sections 70178, 70186
(A) : 3 students
(B) : 15 students
(C) : 4 students
(D) : 11 students
(E) : 1 student