Astronomy current events question: Abell 2744 "ghost light"

Astronomy 210L, fall 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!)
Felicia Chou, Ray Villard, and Mireia Montes, "Hubble Sees 'Ghost Light' From Dead Galaxies," (October 30, 2014)
NASA's Hubble Space Telescope picked up infrared "ghost light" in galaxy cluster Abell 2744 from stars:
(A) on a collision course with each other.
(B) with extreme gravitational redshifts.
(C) ejected from broken-apart galaxies.
(D) that exploded as type II supernovae.
(E) consumed by a supermassive black hole.

Correct answer: (C)

Student responses
Sections 70178, 70186
(A) : 2 students
(B) : 3 students
(C) : 23 students
(D) : 5 students
(E) : 4 students

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