How fast was the earth spinning 65 million years ago

how fast was the earth spinning 65 million years ago

Hundreds of millions of years ago, a day was only about 22 hours longthe result of a planet spinning about its axis more rapidly than it is now. The day's length varies slightly from year to year, as well; the result of myriad forces both on and off Earth pushing and pulling at its rotation. Each day is different than the last. The Earth has been spinning like a top ever since it formed. The way celestial bodies develop, by a gradual gravitational accretion of rocks and dust floating in space, results in a natural rotational movement.
  • Scientists say Earth is spinning faster than it has in decades
  • How many hours were in a dinosaur's day? › Ask an Expert (ABC Science)
  • Please Donate
  • Deep Impact and the Mass Extinction of Species 65 Million Years Ago – NASA Solar System Exploration
  • Was weaker gravity responsible for large dinosaur size? | Galileo's Pendulum
  • Have you considered the effect on the weight i. The mass of all life put together is tiny compared to the mass of nonliving matter on Earth — the rocks in the interior, the core, the mantle, etc. Memo to myself! Also Brian Switek was telling me last night on twitter that his new book has a small bit about gravity in it. Do you discuss it anywhere else?

    Apologies I if gave that impression. The EE link milluon interesting though — always interested in augments against it as for it. I will automatically delete comments that consist only of advertisements for such work, just as I would for commercial products. My comment is not an advertisement. It supports the subject of this thread, i.

    Your steadfast opposition to posters who have different views, than yours, about the possibility of lower surface gravity in the distant past gives one the opinion that you eyars an agenda which you are not revealing. Are you threatened, economically or otherwise, if it turns out that it is scientifically established that surface gravity was, in fact, lower in the past?

    The expanding earth theory and even the hollow earth theory is just as idiotic as the theory that the Sun was the center of the solar system years ago. This goes double if you insult my intelligence and that of my readers.

     · Did the Earth rotate faster in the past? Does the Earth wobble as it spins? Will the equinoxes and solstices switch places in 13, years because of the precession of the Earth's rotation axis? What effect did the Moon have on the Earth million years ago when it was 21, miles closer? By how much does the Earth wobble?  · Chicxulub and the Cretaceous-Tertiary Boundary. About 65 million years ago at the boundary between the Cretaceous (the last geological period of the Mesozoic) and the Tertiary eras, a large asteroid came rushing out of space at a velocity of more than 25 km per second and impacted the Earth at the tip of the Yucatan platform.  · The phenomenon of the Earth tilting on its axis every now and then is known to scientists, however, a new study published in the journal Nature Communications has suggested that these events happened much earlier than what is documented. With evidence found from millions of years old fossils in Italy, the study revealed that the Earth tilted to a massive 12 degrees nearly 84 million years ago Author: Republic World.

    Thank you. It may be my script blocker, I have to use a rather severe one to keep my somewhat outdated PC safe. Feel free to remove the comment. Yet another comment deleted for expounding a theory of changing gravity. I reserve the right to edit or delete comments of that sort summarily. The size of the Earth is an equilibrium between internal pressure due to compression and weight due to gravity.

    A smaller proton mass would mean a lower gravity, which would mean a larger Earth, which also means lower gravity. The smaller Earth surface area today would have required recycling of ocean floors but if it happened over tens of millions of years then maybe the continents could survive. My background is physics, paleontology is a hobby.

    That would take away some of the benefit of the lower gravity. Probably no big deal for a sauropod, though — thanks to those handy air sacs. Has much work been done on this? Excellent demonstration! Could you do the same to show that higher air pressure could not have sufficiently reduced the weight by means of buoyancy?

    If not a change in the fairly secure physics of gravity, what are your views on what else could have been responsible for the large size of dinosaurs.

    Scientists say Earth is spinning faster than it has in decades

    In our posts, Brian and I took pains to point out that, while dinosaurs are phenomenal in many ways, the mystery of their large size has been solved without the hears to hypothesize crazy physics or geological phenomena. I am struck by your extremely strong statements that are in complete disagreement with the evidence. When you say that the problem is solved who believes you beside yourself and the handful of people that submitted this nonsense hypothesis?

    Remote-controlled models are neither here nor there. Has anyone made a realistic mechanical model of a bird or bat that flies exactly the same way, from take-off to landing? Yet we know how birds fly very well, even the weird ones like albatrosses.

    How many hours were in a dinosaur's day? › Ask an Expert (ABC Science)

    Your post from which I have quoted above is, if I may say so, very un-scientific. This is supposed to be a scientific forum, not the bar in the local pub! I have no ideas about what made dinosaurs grow large — that is well outside my knowledge or interest. However, as an aerodynamicist pterosaur flight most certainly is. Whenever I read items about flight from palaeontologists, they invariably give eafth their degree of innocence concerning both the theory an practice of aerodynamics.

    Eargh me give you some examples:. There are only two. Second; The idea that Quetzelcoatas n. How can a creature the size of a giraffe, with a wing loading greater needing a speed of over 30mph to generate lift, get to that speed in wgo single bound with its wings still folded by the way. I came into the field of bird flight 40 years ago as a Cadet at the RAF College and the topic comprised my graduation thesis.

    Since then I have been flying model aircraft including model birds and I have also had access to RAF Wind Tunnels, to run tests on recently killed bird wings. Since you are so eqrth that Q. A few numbers and demonstrations might help. Yes, those articles I linked are non-technical pieces aimed at non-specialists, but they point to decades of published research by experts.

    Your paleontologist colleagues indeed ARE working on models of pterosaur flight by hkw Do they really know what a snap-stall is? Or the function xgo the alula feather? For Q. The result is a creature with the flying ability of a house-brick! Either some of these have got to be reconsidered radically, or the formulae for modern aerodynamic theory needs to change instead.

    Please Donate

    Air density is about the only one we can alter. Thick Atmosphere? Give us the numbers weights, lengths, masses etc and we can pin down the physics. That is all spinnkng aerodynamicists need to work on. But with the physical characteristics given to us by the paleontologists, I would put my reputation such as it is on Q. Lets stick to simple gliding for the moment, we can look at takeoff and flapping flight later.

    I put it to you, Dr Francis, that Q. By glide I mean that it could not sustain controlled descending flight below about 70mph.

    Deep Impact and the Mass Extinction of Species 65 Million Years Ago – NASA Solar System Exploration

    But then what does it do? How does it get airborne again, having assumed it has landed like a vulture to eat. With a stall speed of 70mph, it would need Dr Habib himself to give it a powerful push to get it up to the 70mph launch speed in the single bound he has allowed it! People think that the Wandering Albatross has difficulty taking off.

    It does, but only from land. With webbed feet, constant high winds and waves that can push it up into the airstream, Diomeda Exulans gets airborne much more easily from the sea than from the land. I know because I have watched them from the Falkland Islands. Incidentally did you know that D. These birds fly really fast — a function which cannot be appreciated on film or TV.

    I have stood on the harbour wall at Port Stanley. As an RC Glider enthusiast, I can tell you that these birds were whistling past me at twice the speed of my models.

    Was weaker gravity responsible for large dinosaur size? | Galileo's Pendulum

    Wing loading again. So give me your vital statistics for Quetzalcoatlas and we can work on the aerodynamics between us. Quetzalcoatlus northropi is the smoking gun for reduced surface gravity during the Mesozoic. Reasonable people realize that a flying animal, whether a reptile or not, that is frequently illustrated as being as tall as a giraffe, could not possibly fly if it existed today.

    Robert T. He does offer a characteristic of the short-tailed pterodactyls that, I believe, helps to explain this. He notes that the short-tailed pterodactyls had longer forearms. If surface gravity increased during the late Mesozoic, fsst that were able to evolve an increase in their wing area to mass ratio would be better suited to survive.

    And, as surface gravity continued to increase, pterodactyls with larger and larger wings should evolve. This is exactly what we see. A rapid increase in surface gravity at the end of the Cretaceous along with a limit to the wing area spinninv mass ratio would doom all pterodactyls. Incidentally, a propos the gravity theory; just assuming we could prove that there was increased gravity in the Mesozoic.

    How did it disappear again? There is a third explanation. Surface gravity would lower on one part of the surface and commensurately lower antipodally, i. And, if the 3 parts periodically moved back toward Earth-centricity and away again, there would be corresponding rises and falls of surface gravity.

    Please take this discussion to your own websites. We wxs to real physics here. In azdharchid pterosaurs, there is a very specific, constrained size relationship between the delto-pectoral crest, the coracoid flange, and the torso size. Since all three are preserved in Quetzalcoatlus species and the Quetzalcoatlus northropi delto-pectoral crest is also preserved intact, the size of the northropi torso can be approximated to a reasonable degree of confidence.

    The average distance from notarium socket to acetabulum in Q species is just over 12 inches. So, in Q northropi it is milloon about 25 or 26 inches. In short, the animal is nowhere near the volume of a giraffe and the weight is nowhere near kg.

    how fast was the earth spinning 65 million years ago

    The quad launch was first described during a talk that Paul MacCready and I gave at a Conference spknning late February, eaarth Launch required an acceleration of roughly 4. Lets take them one at a time: 1. All your references to the Q. There is simply not enough volume in your torso to handle the massive musculature which flapping such a huge wing would need.

    This is known as a mean solar day. Start the day smarter. Get all the news you need in spinbing inbox each morning. The Earth's rotation can change slightly because of the movement of its core and also, surprisingly, because of weather and ocean patterns. Salstein, an atmospheric scientist from Atmospheric and Environmental Research, said in But was it the hottest on record?

    The recent acceleration in Earth's spin has scientists talking for the first time about a negative leap second, LiveScience said. Instead of adding a leap second, which has been done several times before to make up for a slowing of the Earth's rotation, they might need to subtract one.

    Because of the earth's inconsistent speed, scientists in the s created an atomic clock fsat keep precise track of time. However, as the Earth's rotation can vary, the atomic clock continued steadily ahead and the two time indicators grew farther apart.

     · Scientists say Earth is spinning faster than it has in decades. Even the Earth wanted to be over in a hurry: Our planet spun faster than normal last year, scientists say. As noted on.  ·  million years ago, it would have been spinning at million miles per hour! The dinosaurs would have flown off the earth. If the deceleration rate is inaccurate by 95% (assume it is slowing more slowly), then million years ago, it would be spinning at , miles per casinocanli.cos: 2.  · Hundreds of millions of years ago, a day was only about 22 hours long, the result of a planet spinning about its axis more rapidly than it is now. For billions of years, Earth’s rotation has been gradually slowing Nathaniel Scharping.

    To fix that inconsistency, scientists then created UTC Coordinated Universal Time to help bridge the gap milliin Earth time and the atomic clock. However, the atomic clock continued to race ahead, so at least once every 10 years scientists added an extra leap second to the UTC to keep them closer together.

    It's particularly important for things like GPS navigation. Aloha, aliens?

    1 thoughts on “How fast was the earth spinning 65 million years ago”

    1. Jenn Kutty:

      Even the Earth wanted to be over in a hurry: Our planet spun faster than normal last year, scientists say. As noted on LiveScience , the Earth's 28 fastest days on record since all occurred in , with Earth completing its revolutions around its axis milliseconds quicker than average.

    Add a comments

    Your e-mail will not be published. Required fields are marked *