I loved the shit out of this game on my Commodore Amiga 500. It was a 3D space simulator and, IIRC, had a fully working solar system. You could fly from a planet's surface into space, come to a halt and watch as moons orbit around planets and planets orbit around their star. I also remember tractor-beaming shit on a planet's surface and trying to drag it into orbit. Oh, and those space whales with their eerie songs! Thinking back on it, it was an amazing open-world game and even more amazing considering it was released in 1988. I had always hoped a studio would create a sequel to this on modern hardware.