What is the #Theory of #Relativity ?

Albert #Einstein ’s theory of special #relativity, which he published in 1905, explains the relationships between speed, time and distance. The complicated theory states that the speed of light always remains the same—186,000 miles/second (300,000 km/second) regardless of how fast someone or something is moving toward or away from it. This #theory became the foundation for much of modern #science .