Newton and Einstein, the most commonly known geniuses to mankind !
However, Einstein discovered a flaw in one of Newton's laws. Eager to know what that is? Here you go...
Gravity, one of the earliest discovered forces by humans, was discovered by Newton 300 years back. The law of gravity.
Using his gravitational equation as basis, we have been measuring gravitational strengths till date
For instance, in rocket science...
the determination of the path and speed of a rocket is heavily dependent on the gravitational strength that acts on the rocket
Similarly, in order to keep a satellite intact in its orbit around earth...
the gravitational strength or force acting on it must be determined before hand
In all these fields, to determine gravity...
scientists have been using Newton's gravitational equation as basis so far (see video for equation)
Even though, Newton's formula appears to be the most accurate to measure gravitational strength...
He was unable to answer one profound question...
HOW GRAVITY WORKS ?!
He never found the answer to this question during this life time
Not just Newton...
Many other scientists researched on this following Newton and...
no one was able crack this for the next 200 years. Until...
During the 20th century, there was a clerk working in Swiz patent office
Everyday after work, during his evening hours, he used to find time to do research on the behavior of light
As the outcome of his research, at the age of 26, he submitted a paper on...
SPECIAL THEORY OF RELATIVITY !
By now, you must know, he is none other than Einstein
In this paper, he tells, the speed of light is constant and...
No object in this universe can travel faster than light
It is based on this concept, Einstein discovers a flaw in Newton's picture of gravity
To understand this better, let's conduct an experiment on our solar system... Imaginary though :)
As we know, all planets in our solar system revolve around the sun in their respective orbit...
Let's imagine  the sun disappears instantaneously... BOOM...
In such a situation, as per Newton's picture of gravity, the moment sun disappears...
all plants must drift away from their orbits around sun escaping sun's gravity instantly and
travel away from the solar system in space in a straight line
therefore, to conclude, per Newton's picture of gravity,
two objects, no matter how far they are from each other, the gravitational impact acting on each other is instantaneous
Now let's bring in some more facts. As we know the distance between sun and earth is 93 million miles.
Light from sun takes nearly 8 minutes  to reach earth, Therefore...
once sun disappears in a flash, it would take nearly 8 minutes for us to witness the darkness created due to this
And, as we know, Einstein proved that no object in this universe can exceed the speed of light
which implies, even gravity is not an exception. To be more explicit, gravity can't travel faster than light.
Recall this fact... it takes nearly 8 minutes for us to witness the darkness created as a result of the disappearance of the sun
In this case, how is it possible for us to feel the impact of gravity alone instantaneously?
This, exactly, is the problem discovered by Einstein in Newton's picture of gravity
Keeping this idea as the base, Einstein did further research on the working of gravity and
wrote and submitted his paper on GENERAL THEORY OF RELATIVITY !
if we redo this sun disappearing experiment taking general theory of relativity into consideration then
gravity and light will travel at the same speed, so after sun disappears
for the next 8 minutes, earth will continue  to move in its orbit without any impact
its only after 8 minutes, that is, after we witness the darkness created due to sun disappearing
earth will begin to drift away from its orbit,  escaping sun's gravity, and move in space in a straight line
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