Astronomy current events question: Titan's methane and ethane rivers and lakes

Astronomy 210L, spring 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!)
Camille Carlisle, "Big River on Titan," December 12, 2012
Liquid methane and ethane rivers and lakes on Saturn's moon, Titan, appear black in NASA Cassini spacecraft radar images because methane and ethane:
(A) reflect or absorb radar signals.
(B) have similar properties to crude oil.
(C) only emit infrared light.
(D) are constantly flowing.
(E) are much colder than Titan's crust.

Correct answer: (A)

Student responses
Sections 30678, 30679, 30680
(A) : 43 students
(B) : 4 students
(C) : 7 students
(D) : 2 students
(E) : 2 students

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