by : Astrophysics in the Glorious Quran
Time is Relative - Age of Universe:
Moslems believe that Paradise and Hell are both much bigger and much more massive than Earth (but still much smaller than God's Throne). The theory of general relativity says that time passes 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/Hell much slower than on Earth. Moslems say that this is what Allah says. It is stated in the Quran that 1 day in Paradise/Hell measures a 1000 years on Earth:
[Quran 22.47] 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.
Here God promises those who do not believe in Hell and punishment that each day of their torture in Hell will measure a thousand years on Earth. So according to the Quran, time passes faster on Earth than in Paradise/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.