The atom emits a spherically radiating electromagnetic wave. They are most often used in static spherically symmetric spacetimes. Most real astronomical objects are not absolutely spherically symmetric. There are only radial modes and the shape is spherically symmetric. To summarize, if "H" is rotationally-invariant (spherically symmetric), then total angular momentum J is conserved. About one-fifth are roughly spherical, but the majority are not spherically symmetric. The scattering is assumed to be "s"-wave scattering, and therefore spherically symmetric. We can assume that a supernova expands in a spherically symmetric manner. In a spherically symmetric Earth, gravity would point directly towards the sphere's centre. An example of which is solving the radial equation for a spherically symmetric potential. This means that a spherically pulsating star cannot emit gravitational waves. Not all central force fields are conservative or spherically symmetric. For gases whose molecules are not spherically symmetric, the expression formula 90 still holds. As such, the model is designed for spherically symmetric molecules. Forming around one-sixth of its mass, M87's stars have a nearly spherically symmetric distribution.