Caught something strange on camera last night...

[Oggie]

I was photographing the sky late last night, as you do. I got a new camera recently and I have been obsessively photographing everything in sight.
Anyway, to get back on track, last night was crystal clear, barely a cloud in the sky. I set up the tripod and mounted the camera on top of it and prepared for some star shots. In order to effectively capture the stars, the camera's shutter speed needs to be slowed right down in order to allow as much ambient light in as possible. Basically, what this means is that you press the capture button once and for the next 30 seconds, the camera captures the image. Any movement, even slight, will cause a dramatic blur effect.
An example of this technique is seen in this image;



So, today I have been sorting through my shots on my PC and I came across this;



Notice the streak in the top right corner.
I was thinking airplane, but it seems to be too high for that and I also did not see it with my own eyes or hear any noise (which I usually do.) Another thing is that I have never once seen an airplane flying in that direction in all the years I have been living here. I should also point out that the picture has not been edited in any way (except for re-sizing), so this is literally what the camera produced. You can see an ultra hi-res version of the image here;

http://homepage.eircom.net/~oggie85/IMG_3272.jpg
What do you all reckon?
I'm guessing either space-station or the Reptilians are here.