He was a rich citizen of Abdera, in Thrace, and a student ofLeucippus, another Greek philosopher. He studied natural philosophy in Thrace, Athens and Abdera. He liked to study geometry and he travelled to many places, includingEgypt,Babylon andIndia. He wrote many books and never married.
Democritus is famous for hisatomic theory of theuniverse. He said the universe is made up of two elementsː the atoms, and the space where they exist and move". He believed that all matter is made up of atoms. They are eternal, indestructible and invisible particles. They are made of different shapes, different properties and they are always moving. He believed the number of atoms is infinite.
Democritus didn't have any scientific evidence. He had these ideas thinking about them. However, his ideas were close to the discoveries made 2000 years after his death.
