This sounds really stupid, but I'm trying to think of a way to make World Turtle work. And what I got after 5 minutes of careful deliberation, would be that the our earth would have to be 'flat' on the back of a giant turtle. And since I don't want mythical space turtles, I'm gonna presume that they live on a planet themselves.

Now disregarding the impracticality of there actually being a turtle who can carry the crust, the environmental changes that will happen from making the earth 'flat' and the general idiocy of this question.

If we took the crust of the Earth, made it like a giant pancake on the turtle's back, how big would the turtle[or is it tortoise?] have to be? And then how big would their planet be?

How it might look like on a smaller scale, since turtles can obviously navigate space.

Hello Turtle

What kind of tags can I even put on this?

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    $\begingroup$ What about the elephants? Tubul, Jerakeen, Berilia and Great T'Phon $\endgroup$ – Separatrix Aug 2 '16 at 12:45
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    $\begingroup$ Turtles are domed and the world is flat, it's going to be a very unstable planet without the elephants to give it a base. $\endgroup$ – Separatrix Aug 2 '16 at 12:50
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    $\begingroup$ I don't mean that the world is literally flat and straight as a washing board. I mean that it at least bends a bit so it's like the turtles shell but at a certain pint the world stops if you know what I mean. . @Annonymus assume that humans don't live on it. $\endgroup$ – Skye Aug 2 '16 at 12:51
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    $\begingroup$ The turtle doesn't live on a planet silly, it lives on another turtles; it's turtles all the way down. $\endgroup$ – iAdjunct Aug 2 '16 at 13:29
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    $\begingroup$ "I don't want mythical space turtles", I want a mythical super-giant tortoise the size of a planet walking along on a mythical super megastructure-sized rocky world. Hmm... Actually... Writing up an answer now. $\endgroup$ – Michael Richardson Aug 2 '16 at 13:42

Your world is a Niven-style Ringworld.

This gives you plenty of space for a "world-tortoise" to wander around in while still allowing you to arbitrarily set your gravity to pretty much whatever you want by setting the spin rate.

To paraphrase Niven, you could lay out the Earth flat, set it down in the landscape, turn away, and never find it again. The Ringworld has a lot of space available.

I would assume the rotation rate is actually fairly slow to give the tortoise only enough "gravity" to keep it walking along the surface, but not crushing it. The "gravity" experienced on the tortoise's back would be actual gravity, since it is so massive.

  • $\begingroup$ Hmm, so it's really really stupidly wide? $\endgroup$ – Skye Aug 2 '16 at 13:58
  • $\begingroup$ I believe the total surface area available was the equivalent of 3 million earth-sized planets. $\endgroup$ – Michael Richardson Aug 2 '16 at 14:14

The world is still a sphere and it's on a 4 dimensional turtle. It’s analogous to a disk laying on a 3D turtle. Just as the flatlqnders can’t look up or down and so are only aware of their disk, if we could look in the 4th direction we would see that every part of the inside of the sphere is resting on the 3D surface of a 4D shell.

The turtle is normal sized. Our little 3D world is “small” in their world.


First of all, we must agree on the species. Do you consider that the turtle is a little red-eared slider (40cm), an African spurred (80cm) or a big sea turltle (more than 1m) ?

If we choose a non-scientific average of 50cm and considering the mean diameter of the Earth (12 742 kilometers) we can find that our planet is 25 484 000 times bigger. If we swap the position, our super-turtle shall measure 324 717 128 000 km, 230 000 bigger than the sun ...

  • $\begingroup$ At least it's smaller than Eta Carinae? :P $\endgroup$ – Skye Aug 2 '16 at 13:54
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    $\begingroup$ but if we choose an 1.5 m tutrle ... $\endgroup$ – Landelin Delcoucq Aug 2 '16 at 14:03
  • $\begingroup$ Mm just choose what rocks your boat, maybe a minimum and maximum answer would be nice? $\endgroup$ – Skye Aug 2 '16 at 14:04
  • $\begingroup$ it will be good but unrealistic a little turtle weights less than 80g and the biggest more than 200 kg. It's like compare a dog and an elephant :) $\endgroup$ – Landelin Delcoucq Aug 2 '16 at 14:11

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