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Many comments ASSUME that what is taught is defined truth. If you want to search for truth, be open minded, logical, and humble.
Ancient philosophers, historians and writers if taken seriously can shed some light on this problem. In more recent times, open minded searchers like Ignatius Donnelly and Immanuel Velikovsky seem to be closer to the truth with every new discovery we find by observation. Their works are difficult to wade through but reveal unsurpassed logical studies, researches and multi-disciplined academic skills. Some of their most violent detractors, having more power than good sense, have squelched a lot of their works without a suitable hearing by reading their works before denouncing them.
Here are few things to keep in mind for serious researchers.
1.) Truth means that which is and not what one wants it to be.
2.) To discard information contrary to current theories, without proof is not science.
3.) Assumptions cannot be relied upon and require proof in light of all latest observations. If you can’t follow or pursue the veracity of an assumption, don’t use it as a basis of your thinking.
4.) Don’t assume that you are a better thinker than others that you may despise for some reason or another, including longevity.
5.) Don’t assume that the ancient philosophers were less capable than the modern. Detailed thinking is time consuming. The ancients didn’t have TV, radio, newspapers, cell phones, Facebook and GOOGLE, email to take up all their real thinking time. The observation of the universe as a whole were not obscured by night lights and other distractions. If what they observed and wrote about still has meaning, there is a good reason to look into it further.
how does the mass extinction, PT, compare time wise to the last known flip of the poles? It would seem plausible that a sudden reversal would have dramatic effects on climate and life on the planet. Even a slow reversal could have the same effects.
Is there a valid way to compare the impact on atmospheric CO2 levels of man’s current contribution with, say, current volcanic activity?
Dinosaurs had not yet evolved at the time of this extinction.
“a meteorite large enough to increase Earth’s mass at the point that the gravity made finding their food”
unfortunately a meteorite that size would essentially resurface the planetary surface with lava, being hundreds if not thousands of times the size of the object that took out the dinosaurs. There is an infamous video which demonstrates the impact of an object the size of Ceres (about 600 miles across) which is many times smaller than Mercury.
basically everything gets reset to the beginning of life on earth.
it’s possible certainly.
As long as the added mass was roughly equal to the mass of Mercury. You’d basically have to add the mass of a sixth of the earth or more to affect gravity that much.
So really, the math doesn’t seem like that’s anything close to plausible.
Maybe the quarter-billion years old rocks was a meteorite large enough to increase Earth’s mass at the point that the gravity made finding their food difficult for big terrestrial animals like dinos.