Astronomy current events question: Jupiter's 2009 dark spot

Astronomy 210L, Spring Semester 2011
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!)

Astronomy.com editors, "Jupiter Scar Likely from Rocky Body," January 27, 2011
http://astronomy.com/News-Observing/News/2011/01/Jupiter%20scar%20likely%20from%20rocky%20body.aspx

Scientists have used evidence from __________ to determine that a dark spot that suddenly appeared on Jupiter in 2009 was due to an asteroid impact.
(A) tracking missing and disappeared asteroids.
(B) nearby asteroid mineral samples.
(C) electrical and magnetic discharges.
(D) several infrared telescope observations.
(E) the Stardust-NExT spacecraft.

Correct answer: (D)

Student responses
Sections 30678, 30679, 30680
(A) : 8 students
(B) : 4 students
(C) : 6 students
(D) : 32 students
(E) : 3 students