Hi everyone,
I recently took an image of the Carina nebula with a camera, lens, and a star tracker, and on one part of the image, there is a big dark irregularly shaped shadow. I believe that this is just dust on my sensor because on my other images of the nebula that was taken a month ago, there was no dark spot. PLUS on images from the internet, there is no black spot. But it looks really real because there are stars that are over it. ._. Below is a picture that is autostretched and screenshotted.
Can someone help reassure me of what it is?
Thanks for reading.