A sphere is a geometric shape that could roughly be described as a ball-shaped object. It can refer to: * Borg sphere, a large spherical starship often used as a long range tactical vessel * Delphic Expanse sphere, creations of the Sphere-Builders to distort space to create an environment that could support them * Dyson sphere, a spherical structure built about a star to harness its energy * Saltah'na energy sphere, a creation to store the essence of a personality * Xindi weapon, a massive sphere shaped device