Astronomy current events question: multiple stellar populations in globular clusters

Astronomy 210L, spring semester 2016
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!)

News release


, "Stellar Parenting: Making New Stars By 'Adopting' Stray Cosmic Gases" (January 27, 2016)
northwestern.edu/newscenter/stories/2016/01/globular-clusters.html

Several old globular clusters contain younger stars, as determined by observations of the __________ of these stars.
(A) pulsation periods.
(B) brightnesses and colors.
(C) rotation rates.
(D) chemical composition.
(E) distances and motions.

Correct answer: (B)

Student responses
Sections 30678, 30679, 30680
(A) : 7 students
(B) : 21 students
(C) : 0 students
(D) : 11 students
(E) : 4 students