Originally Posted by
anduril462
Battlestar Galactica (the remake, I've yet to watch the original) remains very high on my list (possibly favorite sci-fi series ever), as does TNG. I never watched all the X-files when they were on, and haven't made it back to re-watch them from the beginning, in order, but I quite liked them as well.
I have quite enjoyed the first 3 seasons of Falling skies. I think the first two at least are free streaming on Amazon Prime. It's not exploratory, and frankly fairly light on the science part of sci-fi, except that there are aliens with spiffy tech. Actually, it shares a bit with BSG in that it's post-apocalyptic, about people rebuilding. Not quite as profound perhaps, but still good.