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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

physical entity go
an entity that has physical existence

object, physical object go
a tangible and visible entity

whole, unit go
an assemblage of parts that is regarded as a single entity

natural object go
an object occurring naturally

extraterrestrial object, estraterrestrial body
a natural object existing outside the earth and outside the earth's atmosphere

noun.object

2 Subcategories

comet go
(astronomy) a relatively small extraterrestrial body consisting of a frozen mass that travels around the sun in a highly elliptical orbit
meteoroid, meteor go
(astronomy) any of the small solid extraterrestrial bodies that hits the earth's atmosphere