Thanks jakob. You're not ignorant, I didn't know what it was myself at first. I asked about it a couple of weeks ago in here (See thread "Mystery Object" in this forum).
It only appeared in 1 of the 6 frames used to make that image. The consensus was that it was a cosmic ray hitting the sensor in the camera or a micro meteorite that was travelling straight towards the camera.
I should have edited it out of the first frame as it detracts from the show.
Maybe one day I'll fix it up.