Astronomy current events question: finding particles collected by NASA Stardust

Astronomy 210L, spring semester 2014
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!)
Richard A. Kerr, "Spacecraft Returns Seven Particles From Birth of the Solar System," March 21, 2014
Interstellar dust particles in NASA's Stardust aerogel collector were located by:
(A) trained service dogs.
(B) "crowdsource" volunteers.
(C) automatic computer algorithms.
(D) washing down the spacecraft.
(E) radioactivity levels.

Correct answer: (B)

Student responses
Sections 30678, 30679, 30680, 30682
(A) : 1 student
(B) : 39 students
(C) : 10 students
(D) : 7 students
(E) : 6 students

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