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Wellsprings
cosmology

The Void

κενόν

Can there be truly empty space — nothing at all — for atoms to move through? Greek thinkers split sharply over whether the void exists.

The void, or kenon in Greek, refers to empty space itself—the nothingness that exists between and around physical bodies. The atomists Leucippus and Democritus championed this idea, arguing that an infinite void was necessary for atoms to move and collide. Their predecessors, including Parmenides and Aristotle, rejected the concept entirely, insisting that nature abhors a vacuum and that all space must be filled with some substance.

The atomists' acceptance of the void had radical consequences for how they explained motion and change. Without empty space, nothing could move, since movement requires somewhere to go. By admitting an infinite, intangible void alongside atoms, the atomists solved a logical puzzle: they could explain how visible things rearrange themselves while maintaining that at the fundamental level, change comes only from atoms shifting position within the emptiness around them.

Where this idea shows up

25 Greek sources·1 Jewish-canon citation

Where to read it