Quran isn't a science book or it would tell us how to test it's claim the world was expanding rather then just saying it was expanding!!!
It is enough good impression that it actually mentioned the expansion before the advent of telescopes to watch the celestial bodies. Only today's humans enjoy the connection to those verses whilst others who believed in it long ago took the verses as they were because of their faith in their creator. Prior cultures of the ancient also believed earth and heavens to had been one before. Islam confirms that lost knowledge of the ancient. Our technology verifies that part of human culture.