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If you're counting planets orbiting stars other than the Sun, the biggest planet we've found yet is named TrES-4. TrES-4 is like a big fluffy ball: It's 1.7 times as big as Jupiter, but only has 0.8 the mass.
We'll find bigger planets the longer we look. It's hard to spot them with our current equipment because planets don't reflect much light, so we mostly find them by looking at the various ways they interact with their star. We were only able to spot TrES-4 because it passes right between our telescopes and its star (GSC 02620-00648, in the Hercules constellation) every time it completes its 3.5-day orbit.
It would be at least 100 times heavier, since it has to be at least as dense as the sun. In reality, it'd be even heavier than that even if it had the same composition, since it would have higher gravity, which would compress it further.
So no, there are no planets "100 times the size of our sun". They can't get many times larger than jupiter before they turn into stars themselves.



which is the biggest planet?
Which is the biggest planet