Looks alot like something entering the earths atmosphere.
I saw the exact thing here where i live, but i took it as a odd shooting star just burning up coming thru our atmosphere.
That is pretty much the only thing that makes sense since it stays illuminated in the sky then the smoke stops.
Who knows tho, if i saw it here and it happened in florida and in norway then something weird is going on.
im pretty sure its a trident missile, maybe with a new propulsion system. i read that they're trying to upgrade them to better tech since the military first procured this stuff in the 70s