Hi, blogers to I want to write about a special theory of relativity 😯, after the Einstein theory of relativity all scientists believe in Newton s law through it try to explain how univers work? But it not sUfficient to explain the work of univers. So let start the topic in a special theory of relativity explain about time and spece first think is that when the theory of relativity was delivered by Einstein sum of them can be understood what going on. After 100 is it difficult . But try to understand it. First thing time is not a apsolut thing but it is relative it means time is vari it means in a earth time and what time gone in Mars both are different to each other. Iet imagine a train on a train a boy stand and another person from the station observed the train and a boy so for the person velocity of boy is =to the velocity  of train. If that boy run on the train upper suface in a 10km per hour speed so the velocity of boy is =(velocity of train +velocity of boy) . But imagine another thing if the train velocity is =to the velocity of light so in this condition the boy run on a train so the velocity of boy is. Speed of light +velocity of boy but in this condition this answer is ❌ or this consept is not applyed. But question is aries what thinks are act on light and velocity of light becomes constant ? What thing is change. It answer is time and space 🌌🚀 in a speed of light the time is becoming slow and for other univers time is normal. It like it , velocity =displacement/time, it means when velocity is increase the time is dicrease and time dilation like phanomenon is happening. And when the velocity is increase the length is becoming short it called length contraction. This two phanomenon are happening when a object can achieve speed of light. We know that speed of light is a constant is spece to make it a constant when a object achieve light speed it's time become slow . When it travels in light speed due to the no brake the speed of light it length we'll be contract. Through this idea we can do time travel. Theory of spacial relativity told us why time is different for us but it is not full file would you went  to know about what is time? Comment me . In my another blog I write a question if the mass of a particle is zero so it s moment is all so zero by the moment for mula but photon have mass. It aswer is when the E=mc×c  diraive befor this equation another equation is arise that is (E=p२c२+m२c४) if the mass is zero so E=p२c२.it mens without mass momentum is possible. 😯😯😯😯 .