This comment will not contribute anything, and/but it is a thought that I had a few days ago, and I cannot 'shake' it. We keep 'discovering', recognising, mapping, etc. And I feel that every 'breakthrough' is "one step closer" (let's say 100 steps total), on a journey that is a thousand miles long. So, for the past 4000 years (or whichever century we can call the 'birth of astronomy'), we have accumulated 'this much' knowledge, and still we know a speck of sand in a vast desert, and perhaps now we have accelerated the rate of knowledge gathering, but still we are SO FAR.. ufff..