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"planetary system" is correct and may be used in written English.
For example, "The study of our solar system's planetary system is an important field of astronomy."
Dictionary
planetary system
noun
A group of smaller bodies (such as planets or asteroids) that orbit one or more stars.
Exact(60)
"It could create another planetary system," he said recently.
Gliese 581, extrasolar planetary system containing four planets.
Until then, the planetary system seemed to end with Saturn.
The moons form a sort of miniature planetary system.
detected a multiple planetary system around the star Upsilon Andromedae.
It's heartwarming to find a planetary system that finally reminds us of our solar system".
"To this I would add," she adds, "- sometimes a planetary system".
These dirty snowballs re-enter the planetary system periodically as comets.
The first well-established example of an extrasolar planetary system was reported during the year.
The western Pacific is subject to a seasonal climatic regime that replaces the planetary system.
Copernicus recognized more profoundly than anyone else the advantages of a Sun-centred planetary system.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com