What is space made out of? What is the blackness in space?
In: Physics
As for what space is made out of, I don’t know. It’s basically just a volume in which matter and energy can exist. Especially when combined with time as a fourth dimension, it has been described as a “fabric” because things behave differently depending on where they are, leading us to believe it has a slightly non-uniform structure.
But what is the blackness? Simple: the absence of light. There’s a negligible amount of “stuff” in a given volume of space, and deep space appears black because there’s no discernible light coming from that direction. The sky is blue on earth because the sun’s light gets scattered and becomes ambient, but in space, if a light isn’t shining directly into your eyes from the source or from a reflection, you can’t see the object. So a lot of it appears black.
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