Long, long before the discovery of the principles of antimatter and the anti-material 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 anti-material universe is also found in the Bhagavad-gītā. And from all data available it is to be assumed without the slightest doubt that the anti-material world is situated in the anti-material sky, a sky which is mentioned in the Bhagavad-gītā as sanātana-dhāma, or the eternal nature.
Exactly as material atoms create the material world, the anti-material atoms create the anti-material world with all its paraphernalia. The anti-material world is inhabited by anti-material living beings. In the anti-material world there is no inert matter. Everything there is a living principle, and the Supreme Personality in that region is God Himself. The denizens of the anti-material world possess eternal life, eternal knowledge and eternal bliss. In other words, they have all the qualifications of God.