A few weeks ago during the holidays decided to add procedural planets in 3d to the game, I was looking at flat textures of planets and gas giants and I didn't feel confortable with that, so I just added terran type planets and now working on gas giants. Here you can see below a few examples.
And a first gas giant produced today.
There will be many more planet types and moons to explore, you will need to have shuttles in your main ship to land on those places and explore them! since all data is procedurally generated the terrain will be also based on the planet information already created.