Theory of General Relativity

Today, the relativity of time is a proven scientific fact. This was revealed by Einstein's Theory of Relativity at the early years of the 20th century. Until then, people did not know that time was a relative concept, and that it could change according to the environment. Yet, the great scientist Albert Einstein openly proved this fact with the Theory of Relativity. He showed that time is dependent on mass and velocity. In the history of humanity, no one had expressed this fact clearly before. He proved that clocks run slower in stronger gravitational fields (near bigger mass).

According to Islam Paradise and Hell are both much bigger and much more massive than Earth (but still much smaller than the Throne of Allaah). The Theory of General Relativity says that time should pass slower near an object more massive than Earth (clocks run slower in stronger gravitational fields). So according to General Relativity, time should pass in Paradise or Hell much slower than on Earth. It is stated in the Holy Qur’an that one day in Paradise or Hell measures a 1000 years on Earth:

“They challenge you to bring forth that torture [in Hell] and Allah will not break His promise; a day of your Lord [Paradise/Hell promise] is like a thousand years of what you count.”

[Al Qur’an 22:47]

Here Allaah promises those who do not believe in Hell and punishment that each day of their torture in Hell will measure a thousand years of Earth. So according to the Holy Qur’an, time passes faster on Earth than in Paradise or Hell. But this agrees with the Theory of General Relativity which says that time passes slower near bigger mass. Paradise and Hell are much more massive than Earth and time should pass there much slower than on Earth.

How could an unlettered man who lived more than 1400 years ago have figured out this fact?