A sphere is a three-dimensional object shaped like a ball; it may also refer to a sphere-like region or shell. Sphere may also refer to: Astronomy Armillary sphere, a physical model of the celestial sphere Celestial sphere, the astronomical description of the sky Celestial spheres or planetary spheres, refer to a geocentric model of the universe and the associated postulate of a "Musica Universalis" (Music of the Spheres) Hill sphere, the spherical region around an astronomical body where the primary gravitational influence on an orbiting object is that body Spectro-Polarimetric High-Contrast Exoplanet Research (SPHERE) is an adaptive optics system and coronagraphic facility at the Very Large Telescope (VLT) Sphere of influence (astrodynamics), similar to the Hill sphere, but smaller, only about 60% of the radius Sphere of influence (black hole), a region around a supermassive black hole SPHERES (Synchronized Position Hold, Engage, Reorient Experimental Satellites), a formation flight testbed developed by MIT's Space Systems Laboratory SPHEREx (Spectro-Photometer for the History of the Universe, Epoch of Reionization, and Ices Explorer), a proposed space telescope Human sciences Public sphere, an area where individuals can discuss social problems Sphere of influence, a metaphorical region of influence surrounding a country, person or concept Mathematics n-sphere, the set of points at fixed distance from a central point in n+1 dimensional space Spherical surface, the boundary of a sphere (also known simply as sphere in mathematics) Spherical volume, the region inside a sphere (also known as a ball in mathematics) Unit sphere, the set of points at a distance of 1 from a central point Arts, entertainment, and media Films Sphere (1998 film), a film based on Crichton's 1987 novel, starring Dustin Hoffman, Sharon Stone, and Samuel L. Jackson Sphere (2013 film), an animated short film Literature Sphere (novel), a 1987 science-fiction novel by Michael Crichton De sphaera mundi (The Sphere), a medieval astronomy book by Johannes de Sacrobosco The Sphere (newspaper), a British weekly newspaper which ran between 1900 and 1964 Music Groups Sphere (American band), American jazz ensemble Sphere (Japanese band), a Japanese pop idol unit Sphere (Polish band), a death metal band from Poland Sphere3, a Progressive Rock/Jazz Fusion band Albums and songs Sphere (album), a 2005 album by noise music artist Merzbow "Sphere", a song by John Frusciante and Josh Klinghoffer from their album A Sphere in the Heart of Silence (2004) Spheres (Delerium album) "Spheres" (instrumental), a 2007 single by Mike