An astronomical object or celestial object is a naturally occurring physical entity, association, or structure that current science has demonstrated to exist in the observable universe.[1] In astronomy, the terms 'object' and 'body' are often used interchangeably. However, an astronomical body or celestial body refers to a single, tightly bound contiguous entity, while an astronomical or celestial object refers to a complex, less cohesively bound structure, that may consist of multiple bodies or even other objects with substructures. Examples for astronomical objects include planetary systems, star clusters, nebulae and galaxies, while asteroids, moons, planets, and stars are astronomical bodies. A comet may be identified as both body and object: It is a body when referring to the frozen nucleus of ice and dust, and an object when describing the entire object with its diffuse coma and tail. Point Of View Vga Driver Download.

A nebula (Latin for 'cloud';[2] pl. Nebulae, nebul?, or nebulas) is an interstellar cloud of dust, hydrogen, helium and other ionized gases. Originally, nebula was a name for any diffuse astronomical object, including galaxies beyond the Milky Way. The Andromeda Galaxy, for instance, was once referred to as the Andromeda Nebula (and spiral galaxies in general as 'spiral nebulae') before the true nature of galaxies was confirmed in the early 20th century by Vesto Slipher, Edwin Hubble and others.

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