Motion within a infinite space

**Ascended** · September 6th, 2012, 07:31 AM

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**river_rat** · September 6th, 2012, 07:54 AM

Originally Posted by Chrisgorlitz

any part of infinity is also equally infinite

Huh?

**Ascended** · September 6th, 2012, 08:16 AM

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**hashy** · September 6th, 2012, 08:56 AM

The "part" you add or subtract can be finite. Also if you have an object in this infinite universe it defines a unique position, say position O. Any other object can move relative to position O. Alternatively, the initial position of an object can be taken to be O, and any movement would be relative to O.

**Ascended** · September 6th, 2012, 10:21 AM

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**Naggy Doggy** · September 7th, 2012, 05:30 AM

I believe that our universe is actually infinite.

Shape of the Universe - Wikipedia, the free encyclopedia

I postulate that it is IMPOSSIBLE for any spatial universe, of whatever no. of dimensions, to close in on itself like a sphere, or hypersphere.

Why? Imagine you have a spherical pilates ball. Try drawing squares on this ball. Draw the squares such that every square has 8 squares surrounding it. Just like on a grid. You will find that it is IMPOSSIBLE to complete this task.

You can replace the squares with any "tessalable" shape. But you can NEVER form a "tessalable" pattern which covers a sphere. So, if you can't form a grid, you can't form a dimension either.

Therefore our universe is either "flat" or a "saddle". Yeehaw!

**Naggy Doggy** · September 8th, 2012, 04:46 AM

bump.

**Markus Hanke** · September 8th, 2012, 05:41 AM

Originally Posted by Chrisgorlitz

That would mean any movement from any place to another is always an infinite distance.

No, that is a logical fallacy.
Consider the Menger sponge in my avatar - it's surface area is infinitely large, yet it's overall dimensions are well defined, i.e. finite. "Infinity" is not an element of any set, thus you cannot define a term such as "part of infinity". It it simply meaningless. You can't divide "infinity" by something, such an operation is not defined, just like a division by zero is not defined.

**Bud** · September 8th, 2012, 05:53 AM

The Universe is the term for the collective of all matter within space, space is infinite, and all matter within space is in perpetual motion. There are 2 forms of motion in space: propulsion and gravitational. All matter in space is either being propelled via combustion, or being drawn towards a larger body of mass.

**Ascended** · September 8th, 2012, 06:00 AM

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**Markus Hanke** · September 8th, 2012, 06:05 AM

Originally Posted by Bud

space is infinite

We don't know that.

**Bud** · September 8th, 2012, 06:31 AM

Originally Posted by Markus Hanke

Originally Posted by Bud

space is infinite

We don't know that.

I do.

**Markus Hanke** · September 8th, 2012, 06:47 AM

Originally Posted by Bud

I do.

No you don't. You believe it. No one currently knows the global topology and geometry of the universe. An infinite space-time is definitely a strong possibility, but certainly not the only option.