On top of our lack of comprehension of the true vastness of our universe, is also the lack of our knowledge of the 'known' universe. I mean it was only like 2 months ago that we discovered a planet that dwarfs Jupiter in size, barely outside the reaches of our solar system hidden in the Oort Cloud, something like 2-3 AU away. If we are still stumbling on such things that are in (relatively)close proximity, think of what we're missing when the measurements start to get into the truly astronomical scale. Then there's that other fun stat about how little we know about our own oceans(which in truth is probably a more immediately relevant knowledgebase for us as a species to acquire, since it might more readily help our energy and sustainability problems[or not, no guarantees or anything]).
More on topic though: my favorite part of the linked story is the other scientist adding his thoughts about how the life being not impossibly far removed from ours as far as biological makeup goes, and the far reaching impact such a find could have on even our own thoughts of 'creation' and evolution. A discovery like this has the potential to totally change the future of biological sciences, and to be honest(and humble) the more far reaching impact is something all but the most intelligent people in the field probably don't think of(like, I would consider how it maybe effects our thoughts on earth's biological origins, the sustainability of our life in other atmospheres, etc... who knows what more creative/learned minds think of).
Reading stuff like this always makes me want to go bury myself in some books to get more educated on the subjects so that I can more appreciate what is being discovered, and so that I can ramble about it more because... just because.