Long, long before the discovery of the principles of antimatter and the antimaterial worlds, the subject was delineated in the pages of Bhagavad-gītā. The Gītā itself indicates that its philosophy had previously been taught to the presiding deity of the sun, which implies that the principles of the Bhagavad-gītā were expounded by the Personality of Godhead long before the Battle of Kurukṣetra—at least some 120,000,000 years before. Now modern science has just discovered a fraction of the truths that are available in the Bhagavad-gītā.
The assumption of an antimaterial universe is also found in the Bhagavad-gītā. And from all data available it is to be assumed without the slightest doubt that the antimaterial world is situated in the antimaterial sky, a sky which is mentioned in the Bhagavad-gītā as sanātana-dhāma, or the eternal nature.