Not sure how much the Galactic Empires discussion can affect a possible Spelljammer campaign dealing with Blackmoor? Though I suppose the races from that campaign could be used to populate the planets of Blackmoor's solar system. If they have been visiting Blackmoor, they could easily have visited the other planets as well?

Looking at the D20 Blackmoor material, there was the story of the Gnome who invented a machine that allowed him to travel to the Sun. Not sure if he is around anymore, assuming he succeeded? :lol:

-Havard

Couple of things I got from Dave during the years we worked with him;

1 Star; Yellow Sun
5 planets total
Planet is supposed to be Earth sized with comparable weather/tidal
2 moons

City of the Gods module was supposed to be a tie into SJ.

That all I can recall offhand. If I remember any other details I'll post them.