For the uninitiated the X series has been an amazing space game with good longevity. I still have X3 Albion Prelude installed.
It is releasing on GOG today (I just checked my account and the files are not ready to download yet).
GOG page - https://www.gog.com/game/x4_foundations
You cant land on planets like you can in No Mans Sky with this game, but there are large space stations (you can build your own too), and you can fly / fight in any ship with many variattions of weapons while building your fleet and economical support.
The dog fighting in all previous games has been superb, I dont doubt this will be more of the same.
You need a Graphics card that supports Vulkan
Expect all bugs to be fixed within two years (Egosoft are another company historically that are pretty good at polishing up the game and not leaving bugs behind)
And the modding community is pretty good too (but usually the German side of the forum is where the more technically adept and dedicated community hangs out)
http://forum.egosoft.com/index.php?f=152