How atmospheric refraction causes light to bend near massive objects. Not space bending lol
It is the atmospheric refraction which causes the light to bend. Its very simple: Atmospheric refraction - Wikipedia Atmospheric refraction is the deviation of light or other electromagnetic wave from a straight line as it passes through the atmosphere due to the variation in air density as a function of height . [ 1 ] This refraction is due to the velocity of light through air decreasing (the refractive index increases) with increased density. Atmospheric refraction near the ground produces mirages . Such refraction can also raise or lower , or stretch or shorten, the images of distant objects without involving mirages. Turbulent air can make distant objects appear to twinkle or shimmer . The term also applies to the refraction of sound . Atmospheric refraction is considered in measuring the position of both celestial and terrestrial objects. Diagram showing displacement of the Sun 's image at sunrise and sunset Comparison of inferior and superior mirages due to differing air re...