Just finished watching s2. OMG guys. S2ep5 is going to blow your mind!!! I don't say this lightly, but they have raised the bar so, so high for TV scifi.
Just a single episode of the expanse easily surpasses most scifi films even - especially in the effects department.
Like many a good scifi media, there is a published author's book(s) propping up things.
So looking forward to season 3 next year.