The modern concept of a multiverse is derived from quantum physics and string theory, and there are a variety of plausible scientific theories backing up the possibility of parallel worlds. However, the concept is much older, dating to the earliest days of Hinduism. The cosmological concepts in Hinduism are already in a position to readily comprehend and accept modern physics due to their sheer scale in time and space. Ancient Hindu philosophers measured time in millions of kalpas, or eons, each one lasting about 4,320,000 years. Time scales in the Purana texts range from the truti (1/1,000,0000 of a second) to the mahamantavara (311 trillion years).
While the full details of Hindu cosmology are too complex to do justice to here, it is clear that the Hindu scriptures were adamant about the existence of infinite worlds: “Every universe is covered by seven layers—earth, water, fire, air, sky, the total energy, and false ego—each ten times greater than the previous one. There are innumerable universes besides this one, and although they are unlimitedly large, they move about like atoms in You. Therefore You are called unlimited.†(Srimad Bhagavatam 6.16.37)
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