41. We have seen that the totality of the stars which shine in the azure dome is enclosed in a cosmic agglomeration, in the same nebula which you call Milky Way; but, although all belong to this same group, all of the stars are no less animated by their own translation movement in space. Absolute repose exists nowhere. They are regulated by the universal laws of gravitation, and revolve in space under the incessant impulsion of this immense power. They revolve, not in routes traced by chance, but following certain orbits of which the center is occupied by a superior star. In order to render my words more comprehensible, as an example, I will speak specially of your sun.