Okay, okay, okay. It’s not an asteroid, but we think the comet 67P/Churyumov–Gerasimenko deserves a spot on the list.
The European Space Agency’s Rosetta spacecraft visited the comet in Aug., 2014, after a 10-year journey from Earth. For nearly a year, the spacecraft circled the comet, snapping stunning pictures of its gnarled, rocky surface. Rosetta discovered bouncing boulders and, among other wonders, the chemical building blocks of life.
In November 2014, Rosetta deployed the Philae lander, but it bounced into a shadow and eventually lost power, wakening only once, briefly almost a year later. At the end of its mission on Sept. 30, 2016, the spacecraft plunged into the duck-shaped comet.