General Relativity: How Einstein’s theory holds true a century later

Just few hours back Jeff Bezos’ spaceflight company Blue Origin landed its reusable rocket back at its launch site. It couldn’t have come at a time, just when Einstein’s General Theory of Relativity turns 100 years old.
What is General Theory of Relativity?
General Theory of Relativity or General Relativity defines a geometric theory for gravitation, the first force to be understood scientifically.
Albert Einstein published general relativity in 1915 and proposed light to be at