Hubble Images Suggest Rogue Asteroid Smacked Jupiter

Could an asteroid not just fly through Jupiter?

Or if not, probably due to friction, does Jupiter have a solid core of stuff it collected over the years in its gravity well at the center?

edit:got downvoted for some reason, but i was genuinely curious!

The spot first caught the eye of an amateur astronomer in Australia

Where do people discuss/publish this kind of discoveries?