A better version of this article is — THEORY OF RELATIVITY IN BRIEF which is also a featured article on our blog. So, we recommend you to read that article instead of this, and, also that article describes RELATIVITY completely.
We should discuss a quite interesting topic of LIGHT CONES. To understand this, we should find out what PHYSICS tells us about EVENTS and time. An event is a point in space-time whose position can be defined using 4 numbers (3 numbers of three space dimensions and one of time dimension). So, an event is a point in space-time whose position can be described with maximum of 4 numbers. When an event occurs it emits LIGHT and light is a WAVE. A wave is a disturbance in a medium or field. For example, when you drop a stone in water, water ripples are created like this:
About the Author – Madhur Sorout
Sorout is currently a last third year high school student, living in India. His main fascination lies in Physics mainly in the field of general theory of relativity and topics related to it like Big Bang, Black Holes and Evolution of Universe. He likes to make out the meaning of what he see in this universe. He loves to read books by Stephen Hawking, Neil deGrasse Tyson and other authors (and Physicists). He is an atheist and believes that Physics completely rejects the idea of a god. He likes to play cricket also and he wants to continue down the route of research in Theoretical Astrophysics.