For anyone who enjoys this, exploration in "Elite: Dangerous" (for which you need to be neither elite nor dangerous, exploration is peaceful) might be enjoyable for you as well.
From the wiki: Elite Dangerous has a 1:1 scale simulation of the Milky Way galaxy based on real-life scientific principles, scientific data and theories. It includes around 400 billion star systems, modeled on actual galactic charts. Planets and moons rotate and orbit with 1:1 scale in real-time, thus constantly changing a system's environment