Its called Agnus Dei. Thats the adagio for strings name when its performed vocally apparently (i think i learned that from someone here..this place is educational in so many ways!). It conveys such longing to me and is one of the best uses of music ive heard in a game. The choir in homeworld is i believe a Washington DC area choir though i cant remember which one.

The original game had ion cannons on several ships which is as close to lasers as that game got.
Im glad the asteroid fields are better. The flying though the moving asteroid field mission was not only bad astronomy but got it really tricky looking after 100+frigates hopefully with this one i won`t have that frustration again.