spherical shell - Robuta Search

https://en.wikibooks.org/wiki/Moving_objects_in_retarded_gravitational_potentials_of_an_expanding_spherical_shell

https://www.data.gov.uk/dataset/a08926ee-fda7-42a3-864a-4368720c81c3/spherical-shell-rotating-convection-simulation

https://www.aanda.org/articles/aa/ref/2017/03/aa28973-16/aa28973-16.html

Astronomy & Astrophysics (A&A) is an international journal which publishes papers on all aspects of astronomy and astrophysics

https://www.nist.gov/publications/monte-carlo-analysis-spherical-shell-transmission-experiment-new-tallying-methodology