From a radio broadcast of a science journalist's comments I gather the proposal is that the "pollution layer" is intended to diminish insolation reaching the earth and that the layer would need to be far enough away from earth as to be outside the moon's orbit. Which means we'd still be able to see the moon OK but astronomers and their instruments would be looking at stars as through a dark glassly. So would the rest of us.

Cheers, Rowan