re/ black holes, probably, maybe > Space is empty and time is slow Not always slow, and the paths of objects in space are largely determined. Thus we do have

re/ black holes, probably, maybe > Space is empty and time is slow Not always slow, and the paths of objects in space are largely determined. Thus we do have interesting and potentially useful efforts like this: https://www.nasa.gov/planetarydefense/overview https://www.nasa.gov/planetarydefense/overview