A few years ago a friend and I made something similar to universe sandbox, though only with the gravitational simulation part: https://github.com/fayalalebrun/A

A few years ago a friend and I made something similar to universe sandbox, though only with the gravitational simulation part: https://github.com/fayalalebrun/Astraria https://github.com/fayalalebrun/Astraria Surprisingly enough the jar still runs without issue. Something which probably would not be the case for linux binaries, but maybe for windows.