Exocomet
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An exocomet, or extrasolar comet, is a comet outside the Solar System, which includes rogue comets and comets that orbit stars other than the Sun. The first exocomets were detected in 1987 around Beta
Exocomets and various planet-formation processes around Beta Pictoris, a very young A-type main-sequence star (NASA; artist's conception).
Artist's impression of exocomets plunging into young star HD 172555.
Artist's impression of an exocomet falling into white dwarf WD 1425+540.
Hyakutake Color
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.