A spherical shell is the region between two concentric spheres. A thin mass shell at radius , thickness and mass density has mass to first order. Decomposing a spherical body into such shells makes the spherical shell theorem applicable to its gravitational potential energy.
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A spherical shell is a three-dimensional hollow structure that is shaped like a sphere. It is typically defined as the space between two concentric spherical surfaces — an outer surface and an inner surface. The shell has a certain thickness, which is the difference between the radii of the outer and inner surfaces. Key characteristics of a spherical shell include: 1. **Outer Radius (R_outer)**: The radius of the outer surface of the shell.