If there's a comet that should contain its enthusiasm, it's this. Such a large ego in so little a package, like a baby wearing adult's shirt and gaily roaming around the house! From the linked page: Formerly, the Sun was the largest object in the Solar System. Now, comet 17P/Holmes holds that distinction.
Spectacular outbursting comet 17P/Holmes exploded in size and brightness on October 24. It continues to expand and is now the largest single object in the Solar system, being bigger than the Sun
I suppose, like me, you have a minor quibble with how 'big' is defined. I mean, where do you stop the measuring tape: when the mean molecular density at the edge of its atmosphere is some 'n', '2n'? For that matter, how do we measure the diameter of the sun.. I am now so terribly confused.
Apostrophe Avenger here (Elf Eye's alter ego). You are still in possession of a stolen apostrophe, and I demand its return. (Not it's return, I hope you notice.)
Pray, spare me! I have returned the stolen apostrophe.