Zodiacal Dust and Spaceship Detection

[vicky_molokh]

Greetings, all!

In a thread far away a long time ago, upping the amount of zodiacal dust in the setting's solar system(s) was mentioned as a way of making detection of objects in space harder. The question is: how much can it be upped without having other unforeseen/undesirable consequences and how much would it reduce the detection bonuses?

Also, if there are other plausible ways to achieve a similar outcome, they're welcome.

Thanks in advance!