Astronomy current events question: galaxy collision "relic" magnetic fields

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!)

Maja Kierdorf, Rainer Beck, Norbert Junkes, "Giant Magnetic Fields in the Universe" (March 22, 2017)
mpifr-bonn.mpg.de/pressreleases/2017/4

Maps of __________ left over from galaxy cluster collisions were made from observations of polarized radio waves by the Effelsberg radio telescope in Germany.
(A) antimatter.
(B) magnetic fields.
(C) gravitational waves.
(D) neutrino emissions.
(E) gamma rays.

Correct answer: (B)

Student responses
Sections 30679, 30680
(A) : 4 students
(B) : 21 students
(C) : 3 students
(D) : 0 students
(E) : 3 students