Board Thread:Episode Discussion/@comment-23712247-20160203074906/@comment-65.96.114.229-20160403011308

Personally dust feels very similar to the substance of the same name from the games Endless Space/Legend. Given the possibility that dust consists of, basically, psychic nanites, it would make perfect sense that Grimm are simply the dust reacting to the subconscious fears of sentient beings, in a manner similar to the sci-fi classic movie Forbidden Planet.

I'd also like to note that there is no pyhsical reason that dust in a seal container would work any differently in space. Though I suppose there could be narrative reasons. This suggests that dust was ordered (?) to not work in space. This also links up well with the fact that the people of Remnant wouldn't have wanted to launch satelites if they were aware of space Grimm. So we can probably conclude that if Grimm are constructs of dust, this is the reason there aren't any space Grimm.

I would conclude, that while there are many implications to my theory as a whole, one is that Grimm weren't involved in the damage to the moon.