Nebulae question

[AMF]

Looked in the FAQ, but I didn't see this question addressed. I am pretty sure the answer is no, but figured it couldn't hurt to ask: do system-wide obscuring nebulae (like the red type, etc...) ever hide asteroids or other stuff? I am in a game where I am contemplating researching up to nebula sucking tech, but I don't see much use in doing that unless I get some asteroids out of it.

Thanks,

Alarik