A Bernal Sphere is a theoretical space habitat designed by physicist John Desmond Bernal in the 1920s. It is envisioned as a large, spherical structure that rotates to create artificial gravity through centrifugal force. The interior would be designed to support human life, featuring agriculture, living spaces, and recreational areas. The concept of a Bernal Sphere is part of a broader category of space habitats, which also includes ideas like the O'Neill Cylinder and Stanford Torus. These habitats aim to provide sustainable living environments for humans in space, addressing challenges such as resource management and long-term habitation.