Hi, friends I hope all of you Reed my article so in article I want to represent World biggest theory “theory of relativity” So let's start the relativity theory can divide  in two parts, general theory of relativity and another one is special theory of relativity so in this article I represent a explanation of general theory of relativity, in general theory of relativity explan that when a object achive light speed what he experiences. 

Well come to a world of imagine tion but it not liy every think is reality. According to theory of everything. Imagine a object start to move or start to gain velocity due to increase velocity a opposite force act on it that is acceleration. Due acceleration the mass of the object is increase when it is achieved the speed of light it's  mass is infinity ♾️ to move object who have mass infinity . Infinity♾ energy is require. And this is not possible. So the conclusion is that a object have a sum mass so that object can not achive the speed of light. 

If a object or a particle have mass less so it all wase travell in speed of light. It mens photon have no mass or it rest mass is zero. And the speed of light denoted by, [c] =velocity of light. A question is arise if a object can achieve speed of light so for that object time become slow and it done time travel. But object most be mass less because to day infinity power source in not present. According to mass, energy relationship when a mass object achive speed of light it covert in to energy. Formula is( E=MC ×C ) in this equation E =energy , M=mass, c=velocity of light but one is come to my mind why c square, why not c or c to the power 4 or 3 ? This c squer is only for the unit of the energy unit is kg m२/s२  . Another energy equation mgh kg m२/s२.to satisfy the unit of energy this squer is add. According  to Einstein the gravity is nothing but it created due to the space time curve . Space and time act  as a fabric if a object have more mass so it makes a deep curb in a space time. Which have high mass it means it have high gravity. It mens the gravity of high mass object is high  like sun and others star like alpha centauri. Black 🕳 have high mass and it consist high density from the black hole light can not back the center black holes is called the point of singularity and the border of the black hole is event horizon. Only one think car retune from black hole that is radiation that called howking radiation. It not part of theory of relativity but it important to know. By the general theory of relativity we can easily explain what is gravity and how it works in univers. It also explain why mercure orbit is high ly elliptical . These things can not explain by newton law of gravity. The inabulle to explain the what is gravity. And many other thinks. Due to this curv a astronomical phenomenon we'll happen that call "gravitas nal lancing " We know that light all ways travel in a straight lines and in a space and time so due banding of space and  time the path of light is also band it means refraction is space is occurred. Many other phanomen is also happened like length cotraction. Time dilation. Like this.