Album covers

Dear all, Hi, excuse me if I'm butting in, but I'm new to this discussion group thang and I'm not sure of the etiquette, so I'm afraid you'll have to bear with me.

Anyway, to get to the point, I wonder if I could pick your brains for a bit... I'm interested on the original cover art on albums such as the Nubiansof Plutonia and Jazz in Silhouette. (I think that they are done by the same artist and issued on Saturn - basically they are the ones with spacey landscapes on them.) I wonder if anyone could tell me the name of this artist and if he did any other Sun Ra covers and if he did artwork for anyone else. (I remember seeing a signature at the bottom, but I can't remember the name.) Did Ra commission him to draw these particular landscapes/have an input as to what was drawn, does anyone know?

Ok, I've finished now... I'd appreciate any answers, even the name of the artist would be useful.

Cheers, rachel.