What Is Space, Exactly?

We inhabit a 3D world with space all around us: I'm here, you're there and there's a distance separating us. But what really is is that seperates us?

Think a little more deeply about it, and you'll realise that the distances certainly aren't fixed—travel fast enough, and they appear smaller. This video explains how three competing theories for the theory of everything describe exactly what space is. [YouTube]


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