Something crashed into Earth and contributed to ice age extinctions, study says

Around 13,000 years ago, giant animals such as mastodons, mammoths, saber-toothed cats and ground sloths disappeared from the Earth. Scientists have found evidence in sediment cores to support a controversial theory that an asteroid or a comet slammed into Earth and helped lead to this extinction of ice age animals and cooling of the globe.

source https://www.cnn.com/2019/10/29/world/ice-age-extraterrestrial-impact-scn/index.html