Astronomy current events question: confirmation of dark matter-dominated dwarf galaxy

Astronomy 210L, spring 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!)

Susan Gawlowicz, "Lifting the Veil on a Dark Galaxy: Findings Validate Earlier Prediction of Galaxy’s Location," (February 6, 2015)
http://www.rit.edu/news/story.php?id=51213

Cepheid variable stars observed near our Milky Way galaxy confirmed the location of a previously predicted dwarf galaxy:
(A) composed of antimatter.
(B) ejected from the Milky Way.
(C) on a collision course.
(D) dominated by dark matter.
(E) with no central supermassive black hole.

Correct answer: (D)

Student responses
Sections 30678, 30679, 30680
(A) : 3 students
(B) : 7 students
(C) : 3 students
(D) : 37 students
(E) : 0 students