Astronomy current events question: white dwarf dust disks

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!)
Jason Major, "Wreckage Around Nearby Stars Hints at Our Planet's Fate," May 3, 2012
Researchers from the Royal Astronomical Society have observed four nearby white dwarf stars surrounded by disks of materials that could be:
(A) small asteroid belts.
(B) clouds of warm comets.
(C) the start of planetary formation.
(D) jovian planet rings.
(E) shattered remnants of terrestrial planets.

Correct answer: (E)

Student responses
Section 30682
(A) : 3 students
(B) : 0 students
(C) : 0 students
(D) : 0 students
(E) : 14 students

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