great pics! Orbs are always a topic for discussion. Obviously being in that sterile place theres probably no or hardly any dust. My own belief, if there are numerous "orbs" in a pic they are most likely dust, if the pics before and after of the same spot are clear then most likely you have something.
BTW do you live in WA?
Remember - - - 'STRESSED' spelt backwards! is 'DESSERTS'