Additionally, and not so much in the name of science, Kim Kardashian got naked again. And though it might seem unrelated...it helps us put things in perspective. The "Churyumov-Gerasimenko" comet is 3 kilometers wide. To some that may sound small, but the comet that made the dinosaurs go bye-bye was only 2 kilometers wide. Let's take a look at the size relatively and scientifically.