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Ask not how dinosaurs became extinct, ask how they existed (in the first place):

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A New Spin  (Comments cont'd)

'What is this?'

Add a comment via:  e-mail  telejt[delete_me]@shaw.ca




The low-barometric pressure caused wind may also bring the big birds, of that time, to finally come home to roost.

Any attempt to rationalize cold blooded birds, in general, is in trouble. Birds expend very high energy in the process of flying. It's not likely that a cold blooded bird could posses the ability to generate the power required for flying. Big birds, with a wingspan of up to 40 feet (12 m), are even in a bigger trouble to place.

The pre-historic age biggest animals, of all sorts, can have a one-to-one correspondence to the big animals alive today. The biggest plant-eaters correspond to the big elephants. The big predators correspond to something between the lions and the grizzly bears. However, applying the same factor of weight reduction to the big birds would imply that there should be alive today birds with a wingspan of 15 feet (4.5 m).

Not only those birds don't exist at present, it's unlikely such large birds could fly at all. It seems to suggest that the large pre-historic birds were too big even for their own time and their existence can't be explained on the same basis as the rest of the big animals.

glider 747 So what is going on here? Is the whole theory in big trouble? Not, if we consider the unique winds which were constantly blowing. Anything could takeoff in such a wind provided it had a sufficient wingspan much like a '747' taking-off, with one difference -- the '747' capable of generating its own wind.

It's questionable if these flying animals deserve to be classified as birds altogether, since they most likely didn't propel themselves by flapping their wings, but simply relied on the power of the wind to glide. Much like a sailor, who can travel in any desired direction -- including against the direction of the wind -- by skillfully deploying and orienting the vessel's sails, these giant birds could 'fly' using their elaborate wings (probably, more of sails than wings) without expending any significant energy in the process.
fan
bird
"Look Ma!   No flapping!"


-- J.T.
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----- B. Shipham's comment ------

I like the general gist of it, especially as it has been established that the earth's spin is still (albeit minutely: approx. 2 seconds every 100,000 years) slowing. There is one thing that I just can't really buy into: your theory concerning the astronomical body that passed by the Earth thus slowing its spin is plausible enough, I guess, however, the fact that it tilted the earth's polar axis is somewhat tricky. After all, this implies that at some point something else of a similar magnitude occurred which exerted just enough force to halt this motion again. Otherwise, why should the earth not still, even if ever so slightly, be rotating around a lateral axis in addition to its polar axis? The sun's gravitational pull on the Earth can't be responsible for a slowing of rotation around an axis that lies - more or less - on the plane of the earth's orbit. But considering that the Earth is not rotating around a polar axis that is parallel to that of the sun, then the direction of the polar shift your theory is based upon implies that that its axis must lie (at least fairly closely) parallel to the plane of orbit.

Just a thought... ;)

B. Shipham


The author's response:

One way of looking at that is, indeed, the earth keeps on rotating around (the old) lateral axis and this rotation is what constitutes our present earth's spin.

One thing is for sure: it can not spin on one axis and at the same time rotate also on another. Gyroscopes (of which the earth is one) just don't do that!

The celestial event that caused all of that shifting of spin is rare enough. To consider another similar event would be too much even for this author, don't you think?

Nice try, but no cigar.

J.T.
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-------- Matt Weed's comment --------

I enjoyed your article very much.

Could the earlier spin rate be attributed to the earth being much smaller than it currently is? Similar to a ballerina pulling her arms, and thereby spinning faster, could an ancient, smaller earth have simply spun more quickly due to the fact that its mass was closer to the center point? However, would the centrifugal forces on a smaller globe be cancelled out somewhat due to the smaller angular size?

I have been reading many articles regarding the "Expanding Earth" theory, with which I'm certain you're familiar. The theory itself is interesting, and compelling, but I can't find any explanations to handle why such an expansion would have occurred so recently (within the last 200 million years or so) and given the generally acknowledged age of the planet, this would seem to be a sticking point. I.E. why would the earth stay at a relatively small size for so long, and then "suddenly" start expanding. Still, while the mechanism might be unknown currently, it all seems to fit what you're postulating. Perhaps planetary expansion is a common event in the evolution of planetary systems.

Some potential causative factors:

- A miniature black hole passes by the earth's orbit, and its strong gravitational effect begins the "thinning out" process of our planet, and thus slowing down the spin. I really can't see ANYTHING surviving such an event, as it seems the entire planet would have been resurfaced in magma, but still... - Moon capture - how long has our moon been in Earth orbit? Given its small mass, it might not be capable of slowing down the Earth's spin in accordance with your theories. - Little green men?

Anyway, great article, well thought out, and I would love to hear your thoughts if you have a moment.

Take care.

Matt Weed


The author's response:

Could earth, somehow, undergone an expansion which would account for the spin slowing down? If so, how do we account for the likely shift of the spin axis?

-J.T.
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----- Peter Steinbach's comment ------

Nice.
I'm still spinning :-)
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----- Joe's comment ------

My comment was simply to say that I find the observation that large dinosaurs would be too heavy to survive interesting. I agree with the physical basis described in this article.
-Joe
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----- Ian Tulloch's comment ------

Thank you for putting New Spin for public consumption. A very interesting reading ... Have there been any developments on the subject?

Ian Tulloch, (an interested observer)
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Next: Documented evidence from independent sources.




Contents


  • i.   'What is this?'
  • ii.  --The short answer:
  • iii. --The long answer:
  • iv.   For the impatient:
  • v.  'What is next then?'
  • 1.   The bigger they are ...
  • 2.   Is there a limit to growth?
  • 3.   Not convinced yet?  What does rate have to do with it?
  • 4.   Why aren't any such big animals alive today?
  • 5.   What, then, made it possible for them to take their place in the earth's history?
  • 6.   But aren't weight and size one and the same?
  • 7.   Are we talking change in gravity, then?
  • 8.   What is centrifugal force and how could it affect the weight?
  • 9.   What is it that made earth's spin to slow down?
  • 10. Where is the proof?
  • 11. What is there left to do?
  •        Acknowledgment.
  •        Comments.
  •        Appendix: documented evidence from independent sources.