Tomorrow marks the start of the 13,000 year old anniversary and throughout the world we will remember the dead....
https://edition.cnn.com/2019/10/29/world/ice-age-extraterrestrial-impact-scn/index.html
It's called the Younger Dryas Impact Hypothesis and was first suggested in 2007. The hypothesis included the idea that an extraterrestrial body impacted Earth 12,800 years ago. This led to an extreme cooling of the environment, which in turn helped cause more than 35 species of large animals to go extinct.
At the same time, human populations declined. The impact also has been suggested as the cause of large, raging wildfires that created enough smoke to block the sun and created an "impact winter," in which cold weather lasts longer than expected after Earth is impacted.