In physics, spacetime is any mathematical model which fuses the three dimensions of space and the one dimension of time into a single four-dimensional manifold.
“Until the 20th century, it was assumed that the 3-dimensional geometry of the universe (its spatial expression in terms of coordinates, distances, and directions) was independent of one-dimensional time. However, in 1905, Albert Einstein based a work on special relativity on two postulates:
The laws of physics are invariant (i.e., identical) in all inertial systems (i.e., non-accelerating frames of reference)
The speed of light in a vacuum is the same for all observers, regardless of the motion of the light source.”
•Spacetime diagrams can be usual to visualize relativistic effects, such as why different observers perceive differently where and when events occur.
•Einstein framed his theory in terms of kinematics.
Effect of SUN’s gravity on Space-Time Sheet
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Source:
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