EXPERIMENTAL PROOF THAT GRAVITY IS AN ATTRACTION, NOT A REPULSIVE FORCE.
(This experiment can be done at home by anyone)
Make a torsional pendulum using a stick about 1 meter long. Use 2 or 3 fine wires attached at each end to suspend the pendulum at is mid-point. Fix one end of the wires at the mid-point of the stick and the other end to a fixed support. (I used some copper wire strand taken from an old extension power cord. The wires are about 30 to 40 cm long.)
Put a rock or a piece of metal of equal weight, one on each end of the stick; you have now a torsional pendulum, very sensitive with an equal mass on each end.
Let the pendulum find its own stable point; it will oscillate horizontally until the force on one side equals the force on the other side.
Move slowly near the pendulum because any air movement will make it oscillate more.
Place a box on one side of the pendulum at about 3 or 4 cm from the moving mass. When you shine a bright light in that box, the pendulum mass near the box will move back and forth and will get nearer to the box. The movement back and forth may take one hour to stabilize. The rest position at the end will be closer to the box with a light inside. Shut the light and the pendulum mass will return to the original position.
What causes this effect that we call the Boreal effect?
First we have to understand that forces are moving the masses of the pendulum. These forces come from every direction but the horizontal forces are those that affect the most. When the mass is at rest or almost at rest, the forces on each side are equal.
When a light is passing on one side of the mass, light interferes with what is causing that force; there is less force coming from the side where the light is and the force on the other side is now bigger. It will push the mass towards the light. That force on each side is really gravitational force coming from everywhere from space objects. Since light can block gravity, the forces are now unequal.
According to past theories, gravity is supposed to increase if mass increases. But light has no mass and cannot increase gravity. If the moving mass gets closer to the light, it is not because it is attracted to the light but because it is pushed towards the light by the horizontal gravitational force coming from the side away from the light.That also means we fall to the ground not because planet earth is attracting us but because the force over our head is bigger than the force coming from below; Planet earth has blocked some of that force coming from the other side of earth, below us.