Dead pixels with Astronomy Photography

I just got my XSi, my first DSLR camera and made a push button using an old wired hands free and took some shots of the moon / stars.

I learned a few things I didn't think of... like the earth is moving so my 2 minute / 3 minute shots of the stars showed lines

But when I looked at my moon shots I noticed 3 little red pixels, they were also there in the star shots too.. So I guess my question is.. is this normal for astronomy photographs with digital cameras? I remember this happening with cheaper cameras, didn't think it would happen to a DSLR. The pixels don't show up in normal pictures so.. thats why I was curious if this was normal for astronomy photograph shots.

I did have the long exposure noise reduction turned on.

Thanks!

It's only 'normal' in astrophotography because a lot of our backgrounds are very dark, and the dead pixels show up against a dark background. They are still there in normal photographs, they're just not so easy to spot.

If you take dark frames at the same time as your images, these can be used to automatically remove the dead pixels, although I have to admit that I thought the auto noise reduction worked in a similar way to dark frames, so I'm surprised the dead pixels are still in your final image if you had this switched on.