Planetary system
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A planetary system consists of a set of non-stellar bodies which are gravitationally bound to and in orbit of a star or star system. Generally speaking, such systems will include planets, and may incl
An artist's concept of a planetary system
Heliocentric model of the Solar System in Copernicus' manuscript
Illustration of the dynamics of a proplyd
Protoplanetary discs observed with the Very Large Telescope.
Astronomical object
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An astronomical object, celestial object, stellar object or heavenly object is a naturally occurring physical entity, association, or structure that exists within the universe. In astronomy, the terms
Composite image showing the round dwarf planet Ceres; the slightly smaller, mostly round Vesta; and the much smaller, much lumpier Eros
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Mimas Cassini
Portrait of Jupiter from Cassini