Einstein’s theory of general relativity

In 1905, Albert Einstein determined that the laws of physics are the same for all non-accelerating observers and that the speed of light in a vacuum was independent of the motion of all observers.

As a result, he found that space and time were interwoven into a single continuum known as space-time.

Events that occur at the same time for one observer could occur at different times for another. This was the theory of special relativity.

In 1915, Einstein published his theory of general relativity. In it, he determined that massive objects distort space-time, which is felt as gravity.

Gravitational lensing and gravitational waves are strong evidence for Einstein’s theory of general relativity.

Gravitational lensing

Light around a massive object, such as a black hole, is bent, causing it to act as a lens for the things that lie behind it.