Otherwise, some decent posts may be deleted. 

But, just for fun, here's my response to your query:  My understanding of nebulae is considerably less nebular than the nebulous understanding of a non-existent place which possesses the rather nebulous (or is that ominous) names "nirvana," "samahdi," "knowledge," "true self," "atman," "jivatman," and many, many more. 

Actually, my understanding of the content, nature and formation of nebulae is quite specific and complete.  Nebulae are very well understood, these days.  I don't expect anyone to "believe that," I expect them to read about it in recently published papers.  Actually, it really doesn't need to be all that recent.  Nebulae are well known and understood.  Even the one that spells "GOD" in a rather obscure way (read that: you kinda have to squint a little to see the letters).   My personal favorite is the one I like to call the "Rude Gesture" Nebula.