All of earths governments unite to attempt a massive nuclear strike to possible destroy it, project success rate is not good but with no other choice it is enacted. 23 High payload nuclear warheads on suitable launch vehicles are used, with collaboration from NASA, ESA, and SpaceX. A further 11 vehicles with matching payloads are launched from Russia, China and India.
33 vehicles reach the target, 1 failed to retarget due to malfunction.
Each vehicle carrying a 200 megaton adapted warhead reach the target exploding.
After the combined strike humanity eagerly awaits news of the results, all of the worlds instruments and pointed and analyzing.
The dreaded news comes. The main nucleus was fragmented, radar observations indicate the 18km body has shattered into 15 different pieces, with 4 larger 2.8-5.0 km pieces in addition to tons of other gas and matter, the impact is still imminent, we estimate the total damage will be reduced by 7 percent by our strike, the impact site was only adjusted by 2.6 miles. With only 2.35 years remaining humanity begins working on strike two, which should be ready in one year, with an estimated 100 launch vehicles, all of societies resources are being put to use, people are scared, certain private companies are developing spacecraft that will be able to survive 100-500 people for 3 years or more before returning to earth hopefully if its habitable after the strike occurs. Rioting begins to occur in certain areas.
2 years remain.