Astronomy current events question: detection of extra-galactic cosmic rays

Astronomy 210L, fall 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!)

Ryan F. Mandelbaum, "Highest-Energy Cosmic Radiation Comes From a Mysterious Source Beyond Our Galaxy" (September 21, 2017)
gizmodo.com/highest-energy-cosmic-radiation-comes-from-a-mysterious-1818595559

An array of detectors in ___________ by the Pierre Auger Observatory indicate that cosmic rays may come from outside our Milky Way galaxy.
(A) pure water containers.
(B) deep underground mines.
(C) low-Earth orbit.
(D) orbit around the sun.
(E) Antarctica.

Correct answer: (A)

Student responses
Sections 70178, 70186
(A) : 15 students
(B) : 1 students
(C) : 13 students
(D) : 6 students
(E) : 9 students