Astronomy current events question: x-rays from neutron star merger detected

Astronomy 210L, spring semester 2019
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!)

Lee Mohon, "A New Signal for a Neutron Star Collision Discovered" (April 16, 2019)
nasa.gov/mission_pages/chandra/images/a-new-signal-for-a-neutron-star-collision-discovered.html

NASA's Chandra x-ray space telescope recently detected x-rays emitted from the merger of:
(A) black holes.
(B) neutron stars.
(C) elliptical galaxies.
(D) matter and antimatter.
(E) a giant and a white dwarf.

Correct answer: (B)

Student responses
Sections 30679, 30680
(A) : 4 students
(B) : 23 students
(C) : 4 students
(D) : 2 students
(E) : 3 students