I need your help!

This time I tried the very first time to take a picture of a star trail in Namibia, as you can see.
What happened ist, that you can see loads of white and coloured spots (points) in this photo - even on the ground where I dind't see a single star. ;-)

What might be the reason?
(Dirty lens, dirty sensor)

Of course - I sharpened the photo but even on the RAW-photo you can see this dots already.

Thank you for your assistance.

Greetings Enrico

www.oribi.de

PS: shutter speed: "bulb"; about 30-45 min. with 1 (running low) battery but with enough energy for this type of shot.

The warm color comes from the fire that we hat that night and because I started shortly after sunset to take this photo.

No filtes were used.