Certainly I would have expected the orbit to go higher the faster the planets moved? Is that not the usual effect of increasing speed?
I wonder if it’s using some derived equation for the motion of the planets (re: their orbit) that assumes positive mass, so that part of the simulation understands negative mass but part does not?
I agree that, if you are working with checked exceptions, that’s certainly better than adding garbage to your interface.
But for many types of checked exception you just end up wrapping the underlying exception in a foo exception anyway.
I think you are right: if you are using exceptions for error handling, of errors you expect people to actually deal with, this is currently a reasonable (if painful) option to ensure exhaustive analysis of returns — which most people agree is a good thing these days I think, what with mainstream popularization of options etc.