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Astronomical object

physical body of astronomically-significant size,mass,or role,naturally occurring in a universe;single,tightly bound contiguous entity (while an astronomical/celestial object is a complex,less cohesively bound structure,may consist of multiple bodies

Astronomical object refers to something that astronomy studies. It may be any body or structure in the Observable universe. Objects on the Earth are not usually included. This includes objects like nebulae, star clusters, galaxy clusters, galaxies, stars, protostars, planets, satellites, comets, asteroids.