I suggest more unique items/resources/celestials that will convice players to explore. Currently whole universe isn't really cool. It's the same in every place. Some rare planets with cool resources or another celestial objects would make players want to explore.
Example:
Let's say that You can gather gases from rare gas giants to make shields that will make You able to fly into star or something like that.
Example:
Let's say that You can gather gases from rare gas giants to make shields that will make You able to fly into star or something like that.