COMPOSITION Of The Universe In The United States

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As we know, the Universe comprises of space, time and everything perceived to exist physically including all forms of matter and energy and interaction going on between them. Space and time are two basic correlates of universe. In these correlates there is matter and energy scattered around. There is interaction going on between matters, energies and between matter and energy on account of endless processes. These processes are governed by universal laws as explained in the previous chapter.
Universe consists of three elements: (a) space and time, (b) matter and energy and (c) the physical laws governing (a) and (b). On the basis of this Universe can be divided into three analogous elements: matter (the stuff of which
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4) Physical laws were conceived as the rules governing the properties of matter, energy and their changes.

At this juncture I introduce the reader to some more concepts related to the physical aspects of Universe which have been relatively compared and standardized by the human beings on the basis of basic laws by giving it definite name.

Space is the boundless, three-dimensional extent of universe in which objects and events occur and have relative position and direction. This is considered to be of fundamental importance to an understanding of the physical universe.
It is one of the dimensions of universe in which events occur in sequence. Time is the indefinite, limitless, immeasurable, timeless, continued, period in which sequence of events occur in succession from the past through the present to the
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Energy may not be created nor destroyed. This principle, the conservation of energy, was first postulated in the early 19th century, and applies to any isolated system. According to Noether's theorem, the conservation of energy is a consequence of the fact that the laws of physics do not change over time.
Although the total energy of a system does not change with time, its value may depend on the frame of reference. For example, a seated passenger in a moving airplane has zero kinetic energy relative to the airplane, but non-zero kinetic energy (and higher total energy) relative to the

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