As per the Universal Laws of Gravitation written by Sir Isaac Newton and the General Theory of Relativity by Sir Albert Einstein, Gravity or curved spacetime is proportional to the amount of matter or mass contained in a celestial body.
Our universe consists more than 90% of empty space, and heavenly bodies like black holes, stars and planets occupy the remaining. Since all celestial bodies are in reality a huge conglomeration of atoms logically, gravity should exist in an atom too.
An atom consists 99.9% of empty space with the nucleus in the centre occupying the remaining. Is the empty space present in atoms the same as that present in outer space? The answer is yes. Let us find out how.
Our sun is a star whose mass is 330,000 times greater than earth. As per Chandrasekhar limit when a aged star having a mass of 1.4 times that of our sun explodes in an event known as super nova, most of the matter present in it is compressed into an extremely dense object known as a neutron star or a stellar black hole. The diameter of this newly formed compact body will be in the range only 3 to 4 km. Where has the empty space that was earlier present in the atoms contained in the star gone? There is only one thing that could have happened and that is; all the empty space has been squeezed out from within the body to the outside. This clearly establishes the fact that the empty space in atoms is the same as that present in outer space. Hence, any substance that may exist in outer space should exist in an atom also.
From thousands of years renowned western philosophers, scholars and scientists have predicted that space is really not empty and contains an invisible and ethereal substance having elastic properties. The following are some quotes attributed to these famous personalities:
Sir Isaac Newton whom we can consider as the father of gravity
“And first I suppose that there is diffused through all places an ethereal substance capable of contraction and dilation, strongly elastic, and in word much like air in all respects, but far more subtle. I suppose this aether pervades all gross bodies, but yet so as to stand rarer in their pores than in free spaces, and so much ye rarer as their pores are less.”
“I do not know what aether is, but that if it consists of particles then they must be exceedingly smaller than those of air or even than those of light. The exceeding smallness of its particles may contribute to the greatness of the force by which those particles may recede from one another, and thereby make the medium exceedingly more rare and elastic than air, and consequently less able to resist the motion of projectiles, and exceedingly more able to press upon gross bodies, by endeavoring to expand itself.”
Leonhard Euler, a famous mathematician and philosopher of the eighteenth century.
"What is perhaps more likely to be true is that the force of gravity arises from the action of some more subtle matter that escapes the notice of our senses."