Only the core, asteroidal and A sources out of the five Staubach meteoroid classes have been included in the MASTER implementation, since the contributions of the B and C population are negligible within a mass regime above 10 13 kg.

It might be that some massive network of communications, or some shield against asteroidal impact, or some huge astro engineering project that we can't even begin to conceive of, could generate signals at radio or optical frequencies that a determined program of searching might detect.