If light has no mass, why is it affected by gravity?

If light has no mass, why is it affected by gravity?

Isaac Newton, first, suggested that the gravitational attraction between two bodies was proportional to the product of the masses and inversely proportional to the square of the distance between them. Or, simply put; dough attracts dough . Newton gave us a formula to calculate this attraction, and we thank him to this day for it.

However, much later, in the year 1915, a great physicist postulated “Theory of General Relativity”. He was Albert Einstein. He suggested that gravity is not an attractive force between two bodies, but rather the deformation of a tissue that he called spacetime .

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