Astronomy current events question: tidal heating maintains planet habitability?

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!)
Peter Kelley, "Companion Planets Can Increase Old Worlds’ Chance At Life," July 31, 2014
University of Washington and University of Arizona astronomers propose that outer planets use __________ to keep inner planets habitable longer.
(A) reflected sunlight.
(B) solar flares.
(C) greenhouse gases.
(D) magnetic fields.
(E) gravitational forces.

Correct answer: (E)

Student responses
Sections 70178, 70186
(A) : 8 students
(B) : 3 students
(C) : 1 student
(D) : 2 students
(E) : 27 students

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