I am going to talk about what I think heaven might be like from the point of view of modern physics.

First I will start by quoting a hadith that our Prophet Muhammad (peace be upon him) said about heaven, reported by Abu Hurairah:

"A space in Jannah equal to the distance between the middle and the end of a bow will be better than all that upon which the sun rises and sets.'' [Al-Bukhari and Muslim].

This hadith is cited from http:
http://www.witness-pioneer.org/vil/hadeeth/riyad/19/chap372.htm

After I thought about this hadith, I understood that this hadith is clearly telling us something about the shape and geometry of space in heaven. To me, it means that space in heaven is very curved or warped by gravity, which makes it possible for a tiny amount of space to be better and more beautiful than a larger amount of space. Therefore, it is possible that a scientific explanation of heaven could be that the heavens might be the extra higher dimensions proposed by many of today's leading string theorists, because similarly the higher dimensions are said to have an extreme curvature or warping of space by gravity.

String theory, a quest for unification, requires that there be a total of eleven dimensions: 3 dimensions that we can see and touch (lenght, width, height), the fourth dimension which is time, and the remaining seven dimensions are so compactified and warped by gravity that no one has been able to detect them yet. The number of extra dimensions we cannot observe, according to many string theorists, is seven. These seven dimensions are too small and compactified for us to see with our eyes. The number of hidden dimensions- seven- also matches with the Islamic belief that there are seven heavens Allah created. String theory tells us that there are seven more dimensions besides the four that we are familiar with, and similarly it is written in the Quran that there are a total of seven heavens.

The space that make up the higher dimensions are warped and tightly curled-up because of gravity. So in the higher dimensions, a small amount of space has much more information and details than a larger amount of space would have. This description of the extra dimensions put forward by today's physicists I think have a lot in common with what our Nabi (peace be upon him) said about the nature of space in heaven in the hadith that I have mentioned above.