Astronomy current events question: dwarf galaxy Eridanus II dark matter MACHO composition

Astronomy 210L, fall semester 2016
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!)

Allen Zeyher, "MACHOs May Be Out of the Running as a Dark Matter Candidate" (August 16, 2016)
astronomy.com/news/2016/08/machos-may-be-out-of-the-running-as-a-dark-matter-candidate

Characteristics of the dwarf galaxy Eridanus II provide evidence that massive compact halo objects (MACHOs) are probably not the dominant component of:
(A) black hole companions.
(B) gravity wave sources.
(C) dark matter.
(D) star formation triggers.
(E) very young galaxies.

Correct answer: (C)

Student responses
Sections 70178, 70186
(A) : 2 students
(B) : 1 student
(C) : 20 students
(D) : 3 students
(E) : 4 students