He also has worked in celestial mechanics, in particular analyzing the effects of an inversion of the rotation axis of Earth (the results confirm statements in Herodotus and Pomponius Mela). Work in progress regards a new theory for the origin of the Moon (by capture from a passing by planet) and the study of a super Tunguska explosion over northern Germany, which may explain such things as the events of Exodus and the Deucalian flood.