whose idea's about matter were accepted in 500BC Greece out of Democritus's and Aristotle's?

Answer 1

A large planet with many philosophies and many schools.

Contrary to current beleive neither of them were the most popular philosopher of their time.

They simply had writings that were preserved and handed down.

Heraclitus was by far the most accepted philosopher with everyone believing and accepting his theories.

Unfortunately little of Heraclitus writings exist. We are not certain what it was or if it agreed with Democritus's or Aristotle.

Heraclitus & the Dynamic Unity of Reality
All things come out of the One and the One out of all things. ... I see nothing but Becoming. Be not deceived! It is the fault of your limited outlook and not the fault of the essence of things if you believe that you see firm land anywhere in the ocean of Becoming and Passing. You need names for things, just as if they had a rigid permanence, but the very river in which you bathe a second time is no longer the same one which you entered before. (Heraclitus, 500 B.C.)

The ancient Greek philosopher Heraclitus is one of my favourite philosophers, even though we are left with very little of his writings. His central idea is the dynamic unity of reality, 'All is Becoming', 'All is Opposites'. This understanding is similar to the teachings of Buddha (who lived around the same time as Heraclitus).
I find the unification of ancient metaphysics and philosophy with modern physics and cosmology very fascinating and inspiring. Certainly it is now clear that matter interacts with all other matter in the universe (which is why we can see all those pretty stars). Most significantly, the dynamic unity of reality can now be explained (sensibly) with the Metaphysics of Space and the Wave Structure of Matter (which provides an elegant conception of the universe, far superior in its simplicity to the current paradigm of particles and fields in space-time).