As of 2013, we had done all of the following comet investigations EXCEPT ONE. Which is the EXCEPTION?
A)flying past a comet with a spacecraft
B)collecting dust near the nucleus of a comet
C)smashing a projectile onto a comet's surface
D)landing on the surface of a comet

Question

Quizplus · Accepted Answer

As of 2013, we had not yet achieved landing on the surface of a comet. This milestone was later achieved in November 2014 by the European Space Agency's Rosetta mission, which successfully landed its Philae probe on comet 67P/Churyumov-Gerasimenko.

As of 2013, We Had Done All of the Following