Astronomy current events question: Gliese 581g

Astronomy 210L, Fall Semester 2010
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!)

Alan MacRobert, "'Potentially Habitable' Planet Found," September 29, 2010
http://www.skyandtelescope.com/news/104031014.html

The "potentially habitable" planet Gliese 581g orbiting a red dwarf star was discovered by observing the star's:
(A) reflected light.
(B) gravitational wobbles.
(C) eclipses.
(D) parallax.
(E) surrounding dusty disk gaps.

Correct answer: (B)

Student responses
Sections 70178, 70186, 70200
(A) : 0 students
(B) : 19 students
(C) : 2 students
(D) : 1 student
(E) : 2 students