Orb light trail

I took this one the other night. While I've only managed to get maybe 5 shots of them leaving these light trails I think this one is the best for showing that it is not dust. I mean how can dust move faster than the shutter speed while leaving a streak of light? And no it is not a reflection off something as can be seen by the way the one section intersects with the other and the rather uneven amount of light ending in a ball. Put something that glows on the end of a string and swing it around while taking a picture of it and you will know how much different the light is from a reflection. Thats the sort of effect these things sometimes make.