Astronomy current events question: magnifying Abel 2744 Y1

Astronomy 210L, spring semester 2014
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!)

Whitney Clavin, "Looking Back to the Cradle of Our Universe," February 7, 2014
http://www.nasa.gov/jpl/spitzer/galaxy-cluster-abell2744-20140207/

NASA's Spitzer and Hubble space telescopes used __________ to magnify Abell 2744 Y1, the farthest galaxy discovered to date.
(A) a pocket of dark matter.
(B) pinpointing laser beams.
(C) new digital processing software.
(D) an antique slide film projector.
(E) gravity from a nearby galaxy cluster.

Correct answer: (E)

Student responses
Sections 30678, 30679, 30680
(A) : 3 students
(B) : 2 students
(C) : 25 students
(D) : 1 student
(E) : 14 students