Space Time
Space and Time are what
Albert Einstein called "free inventions of the human mind."
They are not as physically "real" as the particles of matter and energy that they contain. Space and Time are mathematical constructs we use to quantify the relations between events, especially the distance between events and the elapsed time between them.
Matter and energy are known as "substances, from the most ancient times in physics, such as Aristotle's.
Aristotle defines substance (Greek: οὐσία ousia) as ultimate reality, in that substance does not belong to any other category of being, and in that substance is the category of being on which every other category of being is based. Aristotle also describes substance as an underlying reality, or as the substratum of all existing things.
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