Posts by Mark‭

In order for an orbit to be stable in the short term, it needs to be within the Hill sphere of its primary. For a circular orbit, the radius of this sphere is approximately: $$r = a\sqrt[3]{\frac...

posted 8y ago by Mark‭

There's a famous saying in science fiction: "Relativity, causality, FTL: pick two". I choose causality and FTL. In a Newtonian universe, where there's a privileged reference frame, the speed of l...

1 answer  ·  posted 7y ago by Mark‭  ·  last activity 7y ago by Mark‭