# Is time a real dimension?

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### Table of contents:

- Is time a real dimension?
- Is the universe 3d or 4D?
- How many dimensions does string theory predict?
- What is string theory trying to prove?
- What is string theory in simple terms?
- What is wrong with string theory?
- Can string theory ever be proven?

## Is time a real dimension?

Scientists propose that clocks measure the numerical order of material change in space, where space is a fundamental entity; time itself is not a fundamental physical entity.

## Is the universe 3d or 4D?

The universe is four-dimensional—three for space, one for time. The universe has nine, or ten or eleven dimensions. Matter curves spacetime.

## How many dimensions does string theory predict?

Current versions of string theory require 10 dimensions total, while an even more hypothetical über-string theory known as M-theory requires 11. But when we look around the universe, we only ever see the usual three spatial dimensions plus the dimension of time.

## What is string theory trying to prove?

String theory turns the page on the standard description of the universe by replacing all matter and force particles with just one element: Tiny vibrating strings that twist and turn in complicated ways that, from our perspective, look like particles.

## What is string theory in simple terms?

String theory proposes that the fundamental constituents of the universe are one-dimensional “strings” rather than point-like particles. String theory also requires six or seven extra dimensions of space, and it contains ways of relating large extra dimensions to small ones.

## What is wrong with string theory?

One of the challenges of string theory is that the full theory does not have a satisfactory definition in all circumstances. Another issue is that the theory is thought to describe an enormous landscape of possible universes, which has complicated efforts to develop theories of particle physics based on string theory.

## Can string theory ever be proven?

Many physicists consider string theory our best hope for combining quantum physics and gravity into a unified theory of everything. Yet a contrary opinion is that the concept is practically pseudoscience, because it seems to be nearly impossible to test through experiments.

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