Astronomy current events question: SDSS 1557's metal-rich asteroids

Astronomy 210L, spring semester 2017
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!)
Bex Caygill, "First Evidence of Rocky Planet Formation in Tatooine System" (February 27, 2017)
The SDSS 1557 system's white dwarf and brown dwarf may be orbited by shattered metal-rich asteroids, based on measurements of:
(A) Doppler shifts.
(B) gravitational wobbles.
(C) magnetic field strengths.
(D) brightness fluctuations.
(E) absorbed light wavelengths.

Correct answer: (E)

Student responses
Sections 30679, 30680
(A) : 2 students
(B) : 3 students
(C) : 8 students
(D) : 6 students
(E) : 13 students

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