Physics Question #345

Sara, a female from the Internet asks on February 23, 1998,

If the first dimension is length, the second is width, and the third is depth/height, what's the fourth dimension? Is there really a fifth dimension? Are there any more than five dimensions?

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The answer

Barry Shell answered on February 23, 1998

There are as many dimensions as your imagination can stand. An infinite number. But you may not be able to experience them directly. As far as space and time, where we live, physicists generally think of the three space dimensions as you list them with the fourth dimension being time. The thing about time is it only goes one way: into the future. The other dimensions are two way. After the fourth dimension there can be as many as you like. Mathematicians and physicists use these higher dimensions for lots of things like network theory, black holes, and much, much more.

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