The progress of random events which randomly or maybe sequential occur in our lives is measured by a specific quantity known as **“TIME”**. **Time** is the indefinite continued progress of existence and events that occur in apparently irreversible succession from the past through the present to the future.

There’s a word — chronometry — that sums up the science of measuring time. Inventions like time and the various ways to measure it all came about when people needed to do something at a particular time.

In this case, people needed to know when to plant crops, so they invented calendars. When they needed to define smaller fragments of time, they invented clocks.

Archaeologists and historians have learned that since the beginning of time people have wanted to measure time.

**Mirror Universe:**

Instead of there being one universe it’s possible that there are actually two, each with time going in opposite directions. Many physicists have wondered why time only goes only goes forward. The answer is that our perception of time is just a product of entropy. Although this idea has its problems. Another answer is that gravity caused time to flow forward. Scientists studied a computer simulation of 1,000’s of particles interacting while influenced by Newtonian gravity. They observed that particles would eventually turn into a low-complexity state of minimum size, and maximum density. They would then expand in two directions, which resulted in two symmetric and opposing arrows of time. Instead of there being one universe, there are actually two with one going forwards in time and the other going backward.

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This was one of the theories that fascinated me to write about time. There are a lot of theories which describes time and its perception, but this has its own attraction.

Until Einstein’s reinterpretation of the physical concepts associated with time and space, time was considered to be the same everywhere in the universe, with all observers measuring the same time interval for any event. Non-relativistic classical mechanics is based on this Newtonian idea of time.

Einstein, in his special theory of relativity, ^{}postulated the constancy and finiteness of the speed of light for all observers. He showed that this postulate, together with a reasonable definition of what it means for two events to be simultaneous, requires that distances appear compressed and time intervals appear lengthened for events associated with objects in motion relative to an inertial observer.

The theory of special relativity finds a convenient formulation in Minkowski spacetime, a mathematical structure that combines three dimensions of space with a single dimension of time. In this formalism, distances in space can be measured by how long light takes to travel that distance, e.g., a light-year is a measure of distance, and a meter is now defined in terms of how far light travels in a certain amount of time. Two events in Minkowski spacetime are separated by an *invariant interval*, which can be either space-like, light-like, or time-like. Events that have a time-like separation cannot be simultaneous in any frame of reference, there must be a temporal component (and possibly a spatial one) to their separation. Events that have a space-like separation will be simultaneous in some frame of reference, and there is no frame of reference in which they do not have a spatial separation. Different observers may calculate different distances and different time intervals between two events, but the *invariant interval* between the events is independent of the observer (and his velocity).

Scientists is still in their pursuit to understand the time and its properties.The biggest mystery of nature will be solved one fine day. till then stay tuned and share your ideas about time in the comment section below.