Astronomy current events question: STEREO discovers eclipsing binaries

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!)

Gemma Lavender, "Variable Stars Under the Gaze of STEREO," April 23, 2011
http://www.astronomynow.com/news/n1104/23stereo/

United Kingdom researchers discovered _________ using NASA's STEREO solar satellites.
(A) sources of sunquakes.
(B) Pluto's carbon monoxide atmosphere.
(C) new eclipsing binary systems.
(D) transiting extrasolar planets.
(E) sunspots near the sun's poles.

Correct answer: (C)

Student responses
Sections 30678, 30679, 30680
(A) : 3 students
(B) : 1 student
(C) : 15 students
(D) : 12 students
(E) : 7 students