Astronomy current events question: dwarf galaxy NGC 4449

Astronomy 210L, spring 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!)
Charles Q. Choi, "Twisted Dwarf Galaxy Warped by Cosmic 'Stealth Merger'," February 8, 2012
The distorted shape and furious star formation rate of dwarf galaxy NGC 4449 may be due to a newly discovered __________ nearby.
(A) dark matter cloud.
(B) supermassive black hole.
(C) dark energy stream.
(D) type II supernova.
(E) smaller dwarf galaxy.

Correct answer: (E)

Student responses
Sections 30678, 30679, 30680
(A) : 3 students
(B) : 9 students
(C) : 1 student
(D) : 6 students
(E) : 31 students

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