Delta - Please Vote.

[Moberg]

I already reverted the music at an earlier point though it seems that didn't make it in yet. During testing, it kinda felt nice but if you're in there for a long while then .. yeah.
The former background looks absolutely hideous in the current atmosphere, and before that.
The gas giant itself didn't change its color, a differently coloured sun shines upon it.

The strong NPC presence outside of secured regions (like a huge area in the south, the entire asteroid field and the entire nebula and the entire central regions around the Freeport) is entirely intended to have an ambient danger (though NPCs are still rather harmless because of their stupid AI, which I also seek to improve) which will only increase the further you venture down to Omicron Major. That means I can also tone down the density, which'll solve the complaints about the amounts of NPCs. There are countless ways to avoid them or bring them down though, so they are not as problematic as some make them out to be.

Further Nomicron updates should solve some problems with the connections.

Iridium will most likely make it's return, possibly as ore/smuggling priced commodity due to the danger you'll be facing while mining it.

The plan for the Nomicron Update intended to get rid if Zeta and let Delta inherit it's atmosphere in a slightly altered way, that's why both look similar (until Zeta is reused elsewhere, that is)

Hopefully those answers give enough insight.