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  4. Leonard Susskind
  5. We often say that the earth is a sphere, but to be precise, ...

We often say that the earth is a sphere, but to be precise, the term sphere refers only to the surface. The correct mathematical term for the solid earth is a ball.

Leonard Susskind
Balls, Earth, Spheres
We often say that the earth is a sphere, but to be precise, the term sphere refers only to the surface. The correct mathematical term for the solid earth is a ball.