Anaximenes used his observations and reasoning to provide causes for other natural phenomena on the earth as well. Earthquakes , he asserted, were the result either of lack of moisture, which causes the earth to break apart because of how parched it is, or of superabundance of water, which also causes cracks in the earth. In either case the earth becomes weakened by its cracks, so that hills collapse and cause earthquakes. Lightning is similarly caused by the violent separation of clouds by the wind, creating a bright, fire-like flash. Rainbows , on the other hand, are formed when densely compressed air is touched by the rays of the sun.  These examples show how Anaximenes, like the other Milesian philosophers , looked for the broader picture in nature. They sought unifying causes for diversely occurring events, rather than treating each one on a case-by-case basis, or attributing them to gods or to a personified nature . 
Aristotle and his student Theophrastus , however, explicitly credit Leucippus with the invention of Atomism. In Aristotelian terms Leucippus agreed with the Eleatic argument that "true being does not admit of vacuum" and there can be no movement in the absence of vacuum . Leucippus contended that since movement exists, there must be empty space. However, he concludes that vacuum is identified with nonbeing, since "nothing" cannot really be. According to Aristotle Leucippus differed from the Eleatics in not being encumbered by the "conceptual intermingling" of being and non-being, and Plato made the necessary distinction between "grades of being and types of negation". 
At the origin, after the separation of hot and cold , a ball of flame appeared that surrounded Earth like bark on a tree. This ball broke apart to form the rest of the Universe. It resembled a system of hollow concentric wheels, filled with fire, with the rims pierced by holes like those of a flute. Consequently, the Sun was the fire that one could see through a hole the same size as the Earth on the farthest wheel, and an eclipse corresponded with the occlusion of that hole. The diameter of the solar wheel was twenty-seven times that of the Earth (or twenty-eight, depending on the sources)  and the lunar wheel, whose fire was less intense, eighteen (or nineteen) times. Its hole could change shape, thus explaining lunar phases . The stars and the planets , located closer,  followed the same model.