Astronomy current events question: remnants of galaxies eaten by the Milky Way

Astronomy 210L, spring semester 2018
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!)

Andre Salles and Aya Collins, "Dark Energy Survey Finds Remains of 11 Galaxies Eaten by the Milky Way" (January 10, 2017)
news.uchicago.edu/article/2018/01/10/dark-energy-survey-finds-remains-11-galaxies-eaten-milky-way

The Dark Energy Camera in Chile discovered 11 streams of stars around the Milky Way galaxy, which are remnants of:
(A) disrupted smaller galaxies.
(B) nucleosynthesis.
(C) dark energy.
(D) matter-antimatter reactions.
(E) type II supernovae.

Correct answer: (A)

Student responses
Sections 30679, 30680
(A) : 29 students
(B) : 1 student
(C) : 8 students
(D) : 3 students
(E) : 5 students