Astronomy current events question: Hubble Space Telescope eXtreme Deep Field

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!)

NASA/European Space Agency press release, "Hubble Goes to the eXtreme to Assemble Farthest-Ever View of the Universe," September 25, 2012
http://www.nasa.gov/mission_pages/hubble/science/xdf.html

The NASA/European Space Agency Hubble Space Telescope eXtreme Deep Field (XDF) photograph of the most-distant galaxies ever imaged was obtained by:
(A) combining photographs of the same view over many years.
(B) gravitational lensing by nearby galaxies.
(C) using specialized polarizing fliters.
(D) advanced image-processing algorithms.
(E) searching in the x-ray region of the spectrum.

Correct answer: (A)

Student responses
Sections 70178, 70186, 70200
(A) : 33 students
(B) : 2 students
(C) : 4 students
(D) : 10 students
(E) : 1 student