The perfect circle or sphere.

[ceptimus]

The event horizon of a black hole is only a mathematical surface in space anyhow. If you had a large enough black hole, so that you could get near the event horizon without tidal forces ripping you to pieces, then you would notice nothing special as you passed the event horizon - the stars would still look much the same as they did before you passed it. Nothing special happens at the event horizon - it's just a place that marks the point of no return.

So if you were happy with the idea of an event horizon as a perfect sphere, you should be just as happy with a surface defined as, 'the surface that is one metre away from a given point'.

 

[Martin]

I keep hoping the earth will slow down, so I will get taller...

Of course, as the Earth's spin slows down, everyone gets fatter.

 

[Walter Wayne]

So, can someone show me a circle where 'pi' = 3?

Am I asking the question right here?

By putting 'pi' in quotation marks I assume you mean the ration of circumfrance to diameter. If you spin a disk fast enough the ratio can be forced to three. See Martin's post above.

Walt

 

[BillyJoe]

It is like relativity, when a spaceship is moving it gets shorter, but that is indetectable if you are inside the spaceship.

Not only is it undetectable, it doesn't actually happen. If you are inside the spaceship, it happens to objects moving relative to you (and only in your frame of reference).

I keep hoping the earth will slow down, so I will get taller...

If Luxy understood this, it would be a cruel joke

BillyJoe
(BTW, I think LuxFerum is actually pulling our legs in this thread. At least I hope so )

 

[LuxFerum]

The event horizon of a black hole is only a mathematical surface in space anyhow. If you had a large enough black hole, so that you could get near the event horizon without tidal forces ripping you to pieces, then you would notice nothing special as you passed the event horizon - the stars would still look much the same as they did before you passed it. Nothing special happens at the event horizon - it's just a place that marks the point of no return.

So if you were happy with the idea of an event horizon as a perfect sphere, you should be just as happy with a surface defined as, 'the surface that is one metre away from a given point'.

Yes that is right. In the same way, 2 sub-atomic particles never touch each other, they simply get to a point where the repulsion force is great enough to make it change his direction.
So the hole idea of surface as something "touch-able" doesn't make sense.
So i keep the idea of a surface as something like this:
"The two-dimensional locus of points located in three-dimensional space."
from here

And that leads me to believe that there is the perfect sphere in this universe, as ceptimus showed.

If Luxy understood this, it would be a cruel joke

I din't

(BTW, I think LuxFerum is actually pulling our legs in this thread. At least I hope so )

No I'm not, I'm really that crazy.