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# Sky limit

Space is the boundless three-dimensional extent and is considered to be bigger than anything we can imagine.Reading this statement a question struck me

1.Do all heavenly bodies exist on the same plane?

2.what really is the sky limit...that is how much vertical motion we can do,can there be any limit?

3.how does space expansion occur?(i think this question is related to second question)

(These questions may seem childish but questions are questions.)

Note by Somesh Rout
4 years, 8 months ago

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well, there is a difference between our universe and space, universe is real, space is an arbitrary collection of dimensions, so u can take the size of space to infinite and finite as per your choice. You can do as much vertical motion as you want as it could be extended per your choice, and if you pick up a three dimensional space, you can put all your heavenly bodies on the same plane. But if you are talking about the real space (the part of our universe), then it is finite, as has already been proved, so there would obviously be some sky limit, and as per present knowledge, all the heavenly bodies should exist on the same plane in this space.

- 4 years, 8 months ago

Well, since planets are 3 dimensional and a plane is 2 dimensional, i am not sure if this is exactly a valid question. If, by this you are asking whether their centre of masses are in the same plane, then that may be answerable. Is that what you're asking?

- 4 years, 8 months ago

obviously i mean centre of masses are coplanar or not?And Why can't they be placed in some other way like all planets and heavenly bodies could be in different plane.

- 4 years, 8 months ago