These are the Periodic comets :) Comets are awesome, so choose a comet, any comet! 1 Long-Period Comet, 2 fictional characters with Comet in the name included.
Took awhile to find some of them that could be used, as a lot of them do not have good pictures or gets put in with other comets when using Google Images... Haha.
Yeah, they also said there may have been a giant collision of a comet many millions of years ago, even before the age of the dinosaurs which caused a mass extinction prior that of which caused the extinction of the dinosaurs or it may have been the third mass extinction event after the extinction of the dinosaurs. (There has been more than one, the Precambrian Event, Triassic Event, and one more within a million years)
Both of these caused the Earth to deep freeze causing the first two Ice Ages to happen. Before either collision, there was no Ice Age because the Earth was 2-6x hotter than our current era has been. Ever since the first, the Earth has always been in a cycle, however each Ice Age has been slightly weaker than the last. I've been trying to self-study Futurology and Prehistory recently :)
Both of these caused the Earth to deep freeze causing the first two Ice Ages to happen. Before either collision, there was no Ice Age because the Earth was 2-6x hotter than our current era has been. Ever since the first, the Earth has always been in a cycle, however each Ice Age has been slightly weaker than the last. I've been trying to self-study Futurology and Prehistory recently :)