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3-sphere physics question?
Im not a student, I am reading a Leonard Susskind book.
Im trying to picture a 3 shere. Would I picture a 4 dimensional space? So, if it was Earth, a line could either travel east, west, south or north, then be back at the beginning 12000 miles later? Then from that point on earth ( if earth was 4 dimensional space) it could travel up or down, and in which ever direction it travels, it will be back at the beginning 12000 miles later?
3 weeks ago i knew nothing about physics, dimensions or anything other than basic adding and subtracting math, so bear with me
PS, I asked this yesterday with no replies (It was Sunday)
@billruss, I appreciate your answer, but my point is to understand Leanard Susskinds concept he is discussing. If this is something you are not familiar with, I thank you for the reply regardless.
1 Answer
- billrussell42Lv 79 years agoFavorite Answer
you got no answer because you need to define your terms, or I have to go read the book.
What is "3 sphere" ? Do you mean a three dimensional sphere?
Yes, earth is a three dimensional sphere, and there is no need to involve 4 dimensions.
"So, if it was Earth, a line could either travel east, west, south or north, then be back at the beginning 12000 miles later? " true, although there are many other directions the line could travel.
Four dimensional space does not exist, as far as we know, so talking about travel in it is just a guess. Stick with 3D save.
