Astronomy current events question: discovery of dwarf planet V774104

Astronomy 210L, fall semester 2015
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!)
Geoff Brumfiel, "Astronomers Spot Most Distant Object So Far In The Solar System" (November 16, 2015)
Dwarf planet V774104, the most distant solar system object discovered so far was detected by:
(A) gravitational lensing.
(B) gamma ray bursts.
(C) motion in photographs.
(D) reflected radio signals.
(E) gravitational forces on inner planets.

Correct answer: (C)

Student responses
Sections 70178, 70186
(A) : 1 students
(B) : 2 students
(C) : 14 students
(D) : 2 students
(E) : 1 students

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