Astronomy current events question: "blue straggler" stars

Astronomy 210L, fall semester 2012
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 Hook, "Stars Ancient and Modern?," October 31, 2012
http://www.eso.org/public/news/eso1243/

Images of globular cluster NGC 6362 from the European Southern Observatory and the Hubble Space Telescope show "blue straggler" stars, which __________ than expected for stars in this globular cluster.
(A) contain less dark matter.
(B) travel slower.
(C) appear younger.
(D) blue-shift more.
(E) are cooler.

Correct answer: (C)

Student responses
Sections 70178, 70186, 70200
(A) : 0 students
(B) : 0 students
(C) : 20 students
(D) : 4 students
(E) : 1 student