Thus, in three dimensions, a mathematical sphere is considered to be a two-dimensional spherical surface embedded in three-dimensional space, rather than the volume contained within it (which mathematicians would instead describe as a ball). The fixed point is called the center or centre, and is not part of the sphere itself.
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From outer space Earth must look like a soap bubble, a Christmas tree ball , a smokey blue marble. The surface smooth. While in fact this glorious ball is full of scrapes, bulges, slopes and scratches, lines, undulations, and men-made straight- lined forms.
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'The world looks nice from outer space
the good old globe looks fine
though every once within a while
I miss that sky-ee line.'
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