Astronomy current events question: extra-galactic origin of distant stars in Milky Way galaxy

Astronomy 210L, spring semester 2017
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!)

Christine Pulliam, "Farthest Stars in Milky Way Might Be Ripped from Another Galaxy" (January 11, 2017)
cfa.harvard.edu/news/2017-02

Our Milky Way galaxy's farthest known stars may have been ripped from the neighboring Sagittarius dwarf galaxy, based on matching the stars' __________ with computer simulations.
(A) positions and velocities.
(B) sizes and temperatures.
(C) ages.
(D) compositions.
(E) fusion rates.

Correct answer: (A)

Student responses
Sections 30679, 30680
(A) : 26 students
(B) : 4 students
(C) : 2 students
(D) : 1 student
(E) : 0 students