Astronomy current events question: oscillation-ejected stars in Milky Way's halo?

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!)
Mari-Ela Chock, "Stars Around the Milky Way: Cosmic Space Invaders or Victims of Galactic Eviction?" (February 26, 2018)
Based on analysis of their chemical composition, groups of stars in our Milky Way galaxy's disk may have been knocked out into the halo from oscillations produced by:
(A) matter and antimatter.
(B) type II supernovae.
(C) a passing dwarf galaxy.
(D) the central supermassive black hole.
(E) dark matter.

Correct answer: (C)

Student responses
Sections 30679, 30680
(A) : 3 students
(B) : 3 students
(C) : 24 students
(D) : 5 students
(E) : 2 students

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