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Spheres are 3 dimensional objects. Space is actually 4 dimensions (well, the math shows more than 4).
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Ok the 4th dimension is time. But how do we visualize it in 4 dimensions. The only way I can think of is taking snapshots for every second of time and put together snapshots to get an idea of it. Now what is the 5th, 6th dimension and how do we observe it?