Newton’s Law of Gravitation
For hundreds of years prior to Einstein, our best Gravitational Theory came from Sir Isaac Newton.
Newton’s concept of the Universe was simple, straight-forward and philosophically dissatisfying to many.
He claimed that any two masses in the Universe, no matter where they were located or how far apart they were, would instantaneously attract each other via a mutual force known as Gravity.
He claimed a certain absolution.
The more massive each mass was, the greater the force, and farther away they were (squared), lesser the force.
This would apply to all objects in the Universe and Newton’s Law of Universal Gravitation, unlike all the other alternatives put forth, agreed with observations precisely.
Gravity and mass are directly proportional to each other. They complement each other.
Where there is mass, there is gravity. Where there is gravity, there has to be some mass.
We are taught that mass warps Spacetime, and the curvature of Spacetime around mass explains the gravity .
So an object around the Earth, for example, is actually traveling in a straight line through curved spacetime.
That makes sense.
But when a mass (like the Earth) moves through Spacetime and bends it, what makes it not stay that way?
What mechanism unwarps that area of Spacetime as the mass moves on?
And more importantly (for now), was Newton right about Spacetime being absolute?