Minkowski space light cone in hindi (Past, Present and Future) Timeline explained

The speed of light is a constant is one of the most important facts about space and time in special relativity. That fact gets expressed geometrically in spacetime geometry through the existence of light cones, or, as it is sometimes said, the "light cone structure" of spacetime.To see that structure, we imagine an event at which there is an explosion. Light will propagate out from it in an expanding spherical shell. In a two dimensional space, it will look like an expanding circle.To have a light cone, we do not need light to be present. The cones map out the trajectories light would take if light were to be present. Since it is just the possibilities that are mapped out, not necessarily the trajectories of actual light. Spacetime still has a light cone structure in the dark!
Spacetime- When we add the extra dimension of time to a space, we produce a spacetime.

Minkowski spacetime -There is nothing special about a spacetime. They can arise in classical physics. So if we mean a spacetime that also behaves the way special relativity demands, then we have a Minkowski spacetime.

Event- These are the individual points of a spacetime. They represent points in space at a particular time.

Timelike Worldline -This is the trajectory of a point moving less than the speed of light. These curves are contained within the light cone. They represent the trajectories of ordinary particles, like electron, protons and neutrons, but not photons.

Lightlike curve -This is the trajectory of a point moving at the speed of light--a light signal or a photon. They lie on the surface of the light cone.

Spacelike curve - This is a curve that lies outside the light cone. If an object is to make this curve its trajectory, it would need to travel faster than light.

Spacelike hypersurfaces - These are the instantaneous spatial snapshots of spacetime. They are three dimensional in the case of a four dimensional spacetime.

Past and future light cones - All the lightlike curves through an event form the light cone at that event. The part of the cone to the future of that event is the future light cone. The part to the past is the past light cone.

Light cone structure - Since the speed of light is generally taken to be the fastest that causes can propagate their effects, once we know how the light cones are distributed in space we can say a great deal about what is possible and impossible causally in the spacetime. So this distribution is of great interest to us. It is called the light cone structure of the space.

Timelike geodesic - These are curves that are the possible trajectories in spacetime of inertially moving points. They are straight lines that lie within the lightcone.

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