Maybe whatever probe they sent to Jupiter has been crushed/exposed to the Jovian elements for so long, the intense gravity and terminal-behemoth storms on/in Jupiter caused an anomaly/imbalance of the chemistry of Jupiter due to the 'alien' (yet still probably present on said gas giant) metals/pancake'd tech being swirled around in the atmosphere at 1 billion G-forces, or the techmetals are on the giant rocky crystalline super-pressurized surface, and it 'oscillated funny' or some superlightning hit it and suddenly PEW.
And it lit up the atmosphere or something. Or something exploded and fell right back to the 'surface' at mach 100 because something just happened to be there at the right time... that shouldn't have naturally been there. Like space rocks.
Maybe Jupiter has some backwards-ass geology going on under all that ammonia we'll probably never know about, and it just happened to make itself visible.
Maybe the Doctor landed the TARDIS on Jupiter.
Or it could be Nibiru or some aliens or whatever.