I am also a huge Firefly fan. Certainly the best Scifi series since SAAB and better imo.

Regarding the astronomy, I am sure you noticed that they changed the intro to the show to clarify that they colonized a brand new solar system and the worlds referred to are primarily moons.

The original intro had given the impression that they were FTLing to various planets around the galaxy. Of course they don't explain how they got there in the first place.

The science was bearable but as usual they leave the artificial gravity unexplained and they don't get into how they terraformed all those moons so fast and with G1.

You would think with that science they could have fixed Earth. And, whats would have been wrong with terraforming and colonizing the moons and Mars in our own solar system and skip the worm hole or however they managed to get there.

Oh well, in spite of all that, it was a damn fine series. It was about the characters and not the science.

The colonies were exactly as I imagine they will be if we ever get off the rock.