There is no question that dinosaurs once inhabited the Earth. This is an undeniable fact, and if you do not concur, you should simply move on to the next article.
Something that has always puzzled me is that life once evolved on this planet such that animals of enormous size were prevalent; whereas today this is not the case. The largest animal on Earth today is a whale; however it is not a land locked animal. This is an important fact to note, as living it’s life in the ocean a whale doesn’t have to succumb to the problems that would inherently be involved with getting around outside of the ocean. Imagine how difficult it would be for an animal the size of a sperm whale to walk (assuming it had legs). The weight of it’s own body would prohibit its motion entirely, unless the leg muscles of this imaginary beast were stronger than any other that currently lives today. Even our largest land locked animals today; animals such as elephants and rhinos are not typically anywhere near the size of the dinosaurs, nor are they very quick. Rhinos can be quick in short bursts; however they spend much of their lives wading in water in an effort to eliminate the stresses of their own weight.
Our planet exerts a force of gravity that is equal to 9.78 m/s squared. Our sole astral satellite, the moon, exerts a force of gravity that is equal to 1.622 m/s squared. Well enough, but what does that mean? It means that while the Earth is pulling objects in space towards it, so is the moon. Since the moon orbits the Earth, the force of gravity on the Earth is directly affected by the counteracting force of gravity on the moon. Again, where am I going with all of this? Through careful study, scientists have been able to determine that the moon (for reasons not relevant to this discussion) is moving further away from the Earth day. In fact, the total distance that the Moon moves away from the Earth is equal to 3.8 cm per year (not a lot). However, 65 million years ago (approximately when the dinosaurs were wiped out by an asteroid or comet), the Moon would have been 247 million centimeters closer than it is today. To put that into perspective, the Moon is currently about 384,000 km from the Earth at any given time. Using our math from above, we can calculate that the moon (65 million years ago) would have been 2,470 km closer to the Earth, meaning it would be 381,530 km from Earth.
That’s not a huge number; however it could be enough to account for other factors, such as the force of gravity that was being exerted on the Earth 65 million years ago. Almost certainly, during the past 65 million years, and even long before that, the Earth was being bombarded with debris from space, resulting in the mass of the Earth to increase. This increase in mass has a measurable and direct affect on the force of gravity.
It is my theory that Dinosaurs were so much larger than animals today for one simple reason. That reason is that they could be. The force of gravity was much lower 65 million years ago, and even many years prior to that. This allowed animals to evolve; however those animals evolved to the size that the force of gravity would allow without those animals being crushed by their own size. It is my further belief that if we were to clone a large dinosaur today, it would likely not be able to survive due to the force of gravity being so much stronger today than it was many millions of years ago.
Then again, I could be wrong. 🙂