For those that might be waiting, breath bated:
Catastrophe - from the Greek, {kappa}{alpha}{tau}{alpha}{tau} -{rho}{omicron}{phi}{ghacu} overturning, sudden turn, conclusion.
Disaster - from the French dis- + astre. Astre meaning star or planet, and by adding the "dis" creates a negative connotation such as with disrepair. A calamity or misfortune. The opposite is benastre, meaning "good fortune."
Much of our current etymology in language is derived from the superstitions of our fore-fathers.
I couldn't get all the Greek letters figured out in the alt-num pad, so I just typed their English equivalents in brackets.