How can I get rid of the wide spread particles based on the galaxy image?

[Coding Darkly]

For a small project, I customized the galaxy image "textures/heightmap7.jpg" to fit my needs.
Everything went quiet fine, but I find the "fog" or "particles" generated in a distance somewhat annoying.

Is there a (simple) way to omit the generation of these particles?

thanks in advance
Grimmer Schnitter

[Coding Darkly]

I presume, the project died meanwhile... :(