Time period of the philosopher Epicurus, who based his physics on the theory of a materialistic universe unregulated by divine providence and composed of indestructible atoms moving in a void.

• 哲学家伊壁鸠鲁时期，他将自己的物理学奠基于一个不被神的眷顾所调节、由空间中不可分的原子所组成的唯物主义的世界之上。建立了伊壁鸠鲁学派并提出“被祝福的生命始于快乐终于快乐”。