On October 23, 2017, at 8:46 in the morning of Washington, DC, an observer from the General Space Administration was staring at the screen in front of him while eating McDonald's chicken burger, suddenly, the talented student with a master's degree from Harvard University seemed to have discovered something, unconsciously put the burger in his hand on the table, and once again, the observer quickly picked up the pen and pen at his hand and wrote a bunch of formulas that ordinary people could not understand at all. Five minutes later, the observer could not confidently look at the calculation results in front of him: 87%, which means that the comet he observed had an 87% chance of hitting the earth.