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Originally posted by SorensDespair
reply to post by MysterE
Are you suggesting that the Earth's mass has greatly increased? Where did the extra mass come from?
To produce an effective buoyancy force on dinosaurs the Earth's atmosphere would have to be thick enough to have a density comparable to the density of water. By summing the forces acting on a typical dinosaur such as a Brachiosaurus the density of the necessary atmosphere is calculated as:
where DF is the density of the fluid, Ds is the density of the substance submerged in the fluid such as the dinosaur, and S.F is the scaling factor. Inserting into this equation a scaling factor of 3.2 and an overall vertebrate density of 970 kg/m3, the Earth's atmospheric density during the late Jurassic period can be calculated to be 670 kg/m3. This says that to produce the necessary buoyancy so that the dinosaurs could grow to their exceptional size, the density of the Earth�s air near the Earth�s surface would need to be 2/3�s of the density of water.
the wonders of our reality often exceed the limitations of many people's imagination
Originally posted by SorensDespair
I haven't read too much into it, but I thought that there was a much higher level of oxygen in the atmosphere in prehistoric times, due to the larger vegetation. I know this resulted in much larger insects.
Originally posted by ADVISOR
I still think it has more to due with the air mixture. For example:
Nitrogen is an essential component of all proteins. Nitrogen deficiency most often results in stunted growth.
Given that the worlds atmosphere was higher in nitrogen, it caused plants and animals of all type to be bigger.
Animals and plants are still essentially the same, based on the "higher life form" principle. When say essentially, I mean we are made from the same building blocks.
For a simple selection of life forms requirments, see search results. you can also replace "Plant" with "Animal" in the linked link.
Point being, gravity as we know it to be, is based on mass and the energy of said mass. the earth has maintained the same approximate mass for eons. Suggesting it to have had a lower gravity based on none solid energy is a theory that needs plenty of work.
Not saying it is impossable, but based on science as we now it, at least how I know it, it is close to not very likely.
Originally posted by Longtimegone
reply to post by InfaRedMan
You can't have mass magically appear. I do believe you are wrong on this one.
to produce the necessary buoyancy so that the dinosaurs could grow to their exceptional size, the density of the Earth's air near the Earth's surface would need to be 2/3's of the density of water
Scientists who study the largest dinosaurs -- a group called sauropods, which includes Supersaurus and Apatosaurus--do not know what to make of the bones. While some small carnivorous dinosaurs had hollow bones, "it has never been mentioned in the literature [on sauropods]," says sauropod authority John S. McIntosh of Wesleyan University in Middletown, Conn.
Any species of four-legged, herbivorous, saurischian dinosaur in the suborder Sauropoda. The sauropods include the largest of all dinosaurs and the largest land animals that ever lived. authority John S. McIntosh of Wesleyan University in Middletown, Conn.
Yet hollow ilia might not be that unusual among sauropods. McIntosh says researchers may not have recognized such features while examining fossils before. Moreover, paleontologists have not had the opportunity to check the insides of unbroken dinosaur bones. McIntosh says computerized axial tomography computerized axial tomography also known as CAT scanning, or other nondestructive tests might reveal whether intact fossils are solid bone.
Diagnostic imaging method using a low-dose beam of X-rays that crosses the body in a single plane at many different angles. , also known as CAT scanning, or other nondestructive tests might reveal whether intact fossils are solid bone.
Aside from finding fine-grained rock inside the bone, Miller says, other signs indicate parts of the Supersaurus pelvic bones were hollow. Much of the recently excavated ilium is crushed, possibly from the weight of sediments accumulating on top of the bone as it fossilized. The Utah researchers have also found bony struts that span the inside of the ilium, probably strengthening the pelvis, which helped support an animal weighing as much as 30 tons.
Miller and others have speculated that hollow bone sections served to cut down on body weight and reduce the amount of bone the animal had to produce. "What I suspect, and this is speculation, is that there was probably something like marrow in there. It may have been a site for blood cell formation," Miller says.
Each year nearly 40,000 tons of cosmic dust fall to Earth from outer space. Now, the first successful chronological study of extraterrestrial dust in Antarctic ice has shown that this amount has remained largely constant over the past 30,000 years
Originally posted by MysterE
A popular theory for the extinction of the dinosaurs is an asteroid impact. Could it be possible that the impact not only extinguished the dinosaurs, but added a signifigant amount of mass to the earth as to dramatically increase the mass, and therefore increase the gravitational field?
What do you think ATS?
Height: 70 feet (21.4 meters) About the size of a six story building.
Length: 120 feet (36.6 meters) Three long school buses end to end.
Weight: 100 tons
Period: Late Cretaceous
Argentinosaurus, recently discovered in Argentina, will probably will turn out to be the largest dinosaur yet discovered, larger than Ultrasauros or Seismosaurus. although Seismosaurus will likely continue to hold the record for total length due to its extremely long tail, characteristic of Diplodocidae. The cross section of one vertebra found of Argentinosaurus measures over five and one half feet in height. Evolutionary biologists believe that dinosaurs were able to reach such colossal sizes due to a colossal metabolism. At the height of its adolescence, Argentinosaurus was probably able to gain about 100 pounds a day!
Originally posted by MysterE
reply to post by SLAYER69
To add to your post, there is the question of how the Brachiosaurus was able to supply blood to it's head (being so much higher then where the heart typipcally is)
Or possibly, it was easier to pump the blood to higher elevations due to lower gravity.