Astronomy current events question: black hole and neutron star merger

Astronomy 210L, fall 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!)

Michael Greshko, "Astronomers Probably Just Saw a Black Hole Swallow a Dead Star" (August 16, 2019)
nationalgeographic.com/science/2019/08/astronomers-probably-just-saw-black-hole-swallow-neutron-star/

Gravitational waves detected from the S190814bv event provide evidence that __________ 900 million years ago.
(A) a sunquake erupted.
(B) a smaller big bang occurred.
(C) a supernova exploded near Earth.
(D) a black hole and neutron star merged.
(E) the Milky Way swallowed a dwarf galaxy.

Correct answer: (D)

Student responses
Sections 70178, 70186
(A) : 0 students
(B) : 0 students
(C) : 2 students
(D) : 37 students
(E) : 0 students