100 years ago today, the prophecy of physicist Albert Einstein, the owner of general theory of relativity, came true when he predicted that light would change its curve trajectory as it passed through great masses such as the sun, stars, galaxies, and other bodies.

The four dimensions of the universe

This happened in 1916 when he developed his general relativity-specific gravity, which he knew at that time a different definition for the definition of "Newton", which was assumed to be the force of attraction between two masses, and "Einstein" defines it as hunching in the temporal caller around the mass.

The temporal caller is a term that includes the three spatial dimensions, length, width and height, in addition to a fourth dimension added by "Einstein" since he developed his own theory of relativity in 1905, which is time.

So that the dimensions that cover the universe are four, one of which is bound to the other, and time runs in relation to those other dimensions, and is affected by the movement and speed of the body.

The camber convex conveys the path of the stars around the large masses (design by Hani al-Dali'a)

Be careful ... fall into space

And the curvature of space-time is the cavity made by the mass around it so that it sinks into it to appear as if it were placed in the middle of a stretched cloth from its ends.

If the light passes through that convex spacetime, take a curved path instead of the straight line that takes it if there is no obstruction in its path.

This was what general relativity theory described as the passing of light by the sun would necessarily change the position of the stars surrounding the sun in the sky, and this can be seen and measured during any total eclipse of the sun.

English physicist Arthur Eddington validates the theory of German physicist Albert Einstein (design by Hani Dhali)

Intuition .. Seize opportunities

This idea, captured by English astronomer Arthur Eddington, and wanted to verify it at the first available opportunity. This happened on May 29, 1919, when the total eclipse of the sun on the island of Principe on the western coast of South Africa in the Gulf of Guinea.

The eclipse and sun occurred in Taurus where many stars exist, and Eddington photographed those stars around the eclipsed sun and then photographed them again a few months after the sun moved away from them.

To find a difference between the positions of the stars in the two images, Einstein's prophecy was caused by the only and certainly certain in his general theory of relativity.

And in less than a year, that is, in 1920 (i.e. 100 years ago), Eddington published the results of his research confirming the validity of what Einstein went to, and when the information reached him he commented, saying: "I never doubted the results of my theory."

Black hole by Event Horizon Telescope, and Einstein's quadrilateral galaxies (Event Horizon Telescope / NASA)

Quasars, galaxies and black holes

Scientists' efforts after that did not stop checking again and again the validity of "Eddington", but with the sending of the "Hubble Telescope" to space in 1990, the cosmic images of strange phenomena began to appear on the astronomers of the earth.

She was impressed by what was known as Einstein's quadrants, arches and circles, which are images of duplicate galaxies appearing in more than one place around a large mass, which is either a giant galaxy or a quasar (a very distant active galaxy) or a black hole.

The prophecies of general relativity culminate in the depiction of the first black hole, a real and direct image through the Event Horizon Observatory in the spring of 2017.