Weird "Spider" Found on Mercury

Now this is one funny shaped crater that the MESSENGER probe was able to find on Mercury. Scientists are baffled on why those weird channels formed after this impact. Maybe the force of the Suns gravity was pulling on the damaged area (which probably turned molten for a time) formed those lines like that. Or maybe it had something to do with magnetism because it kind of looks like what happens when a magnet spreads out iron filings.