Each person who studies physics faces a concept of a space-time continuum. The modern theory of space time is based that all 4 measurements where also time enters, are equal and interchangeable in calculations.
The space-time continuum, or is more often the term used in a "informal" situation space time - it is the physical model describing a concept about Wednesday in which all objects of the world studied by physics stay. It is a theoretical design which is not the exhaustive description of reality, but, whenever possible, gets closer to her most fully. Now the standard theory of a space-time continuum is Einstein's description, it is caused by the theory of relativity. As Albert Einstein spoke, the most correct description of space time "has to be as simple as it is possible, but it is not simpler than it". The modern theory of space time has 4 measurements, 3 of which spatial and one temporary. At the same time three coordinates of space and one time are equal, and depends only on the observer what of them will be taken for a reference system. That is, they are interchanged. The space time has the dynamic nature, and the tool by means of which measurements interact with physical bodies and objects is a gravitation. According to provisions of modern physics, the space-time continuum is a continuous variety, it not flat, but can change curvature dynamically, depending on conditions. For many the shocking fact is that time is put in this theory on an equal basis with other coordinates. The reason of it that the theory of relativity is based that time depends on the speed of the observer who is in a reference point. Time is not independent of measurements of space at all, it is inseparable from them. The most habitual system is the four-dimensional space time, it is sufficient for the solution of many tasks. But in theories of the description of the Universe of measurements it is much more. For example, the bosonic version of the theory of superstrings (oldest of its options) demanded existence of 27 measurements. Today this theory is improved, the number of measurements is reduced to 10. Scientists hope that it will be possible to compactify the theory before observed 4 measurements. It is possible that other additional measurements are simply curtailed and have the punk sizes. But in this case all of them have to be shown somehow. This question is actively studied by physics now.