I want to mention a few things about a gravity lens. Not only is light attracted to the source of gravity, or otherwise flattening a curve, but it also bends light around a massive body like a star. Mercury is seen before it emerges from behind the sun. The light we see from Mercury, lit up by the sun, it bends around from behind the sun, so that Mercury appears beside the sun before it has emerged out from behind the sun.
So since light has no mass and it is not attracted by mass, thus not having anything for gravity to take hold of, then it is the space itself that is bent, in layers of inertial density, or gravitational density. That is the radiant field of mass. Mass is electromagnetic. Gravity is therefore electromagnetic (magneto-electrostatic).
The space is warped around the star in a field of inertial mass density. In other words, gravity has a pushing effect away from itself, simultaneous to a pulling effect toward itself. Gravity is the force that relates to this, because through gravity, the forces of density can be worked with.
Other aspects of Gravity lensing is the decreasing of distance by shortening the frequency (time) of space (Negative Gravitation) ... or increasing the distance by adding more space (higher frequency of space) in between the moments of each second, as we observe naturally.
Machines and experiments have tested Special Relativity so that we understand the above to be true not according to Special Relativity, but easily explained by the Laws of the Universe which are spelled out in the form of the discipline of physics called "Special Relativity."
Gravity has a push, and it has a pull:
Bending light around an object, or bending light toward an object.
Galaxies are held in equilibrium. Space is created in the midpoint between galaxies, as attraction toward the gravity of the galaxies; and space will move to the galaxy to the left, or to the right. At the zero midpoint, it is both and neither.
Also space is created through the gravity field of mass. There is positive, and negative. From Light, all matter is created.
The Gravity Lens of Earth:
Gravity bends light around the curve of Earth slightly, so that a line of sight path is bent around a curved surface, as evident with the post and video below referencing Earth's gravity lens.
How does this apply to a "Flat Earth?" Read on, down the page ...