Astronomy current events question: Smith Cloud magnetic field

Astronomy 210L, fall semester 2013
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!)

Charles Blue, "Magnetic 'Force Field' Shields Giant Gas Cloud during Collision with Milky Way," October 31, 2013
https://public.nrao.edu/news/pressreleases/magnetic-force-field-shields-giant-gas-cloud/

The __________ deep inside the Smith Cloud detected by the Very Large Array and the Green Bank Telescope may explain how it is able to pass through the Milky Way intact.
(A) dark matter core.
(B) x-ray pulsar.
(C) molecular cloud.
(D) supermassive black hole.
(E) magnetic field.

Correct answer: (E)

Student responses
Sections 70178, 70186, 70200
(A) : 9 students
(B) : 0 students
(C) : 7 students
(D) : 0 students
(E) : 42 students