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Which is the biggest solar system in the universe?

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There is only one solar system in the universe and that is ours.
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Not much is known yet about solar systems (or stellar systems) outside our own. Planets have been found around a few thousand stars - out of the estimated 10 to the power 22 in the observable Universe.
You would also have to clarify what you mean by "biggest". Do you mean:
* Largest star (in diameter)?
* Largest star (in mass)?
* Largest number of planets above a certain mass or size limit (the limit would have to be specified)?
* Largest total mass of planets?
* Largest diameter of orbit, of the outermost planet?
* Or perhaps some other criterion.
Whichever criterion you choose - you won't get a very reliable answer yet, based on the limited amount of observational evidence.
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Totally unknown.
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Is the biggest star in the universe bigger than your solar system?

Maybe. The biggest known star is way past the orbit of Jupiter (Source for everything-Science Channel: How The Universe Works; Extreme Stars) note: Biggest star is said to b

What is the biggest satellite in the solar system of?

Ganymede, a moon of Jupiter, is the largest natural satellite in  our solar system. But you could argue that Jupiter is the largest  as it is a satellite of our sun. You cou