Historians accept the history of the world from the time of Buddha, or since 600 B.C., and prior to this period all histories mentioned in the scriptures are calculated by them to be only imaginary stories. That is not a fact. All the stories mentioned in the Purāṇas and Mahābhārata, etc., are actual histories, not only of this planet but also of millions of other planets within the universe. Sometimes the history of planets beyond this world appear to such men to be unbelievable. But they do not know that different planets are not equal in all respects and that therefore some of the historical facts derived from other planets do not correspond with the experience of this planet. Considering the different situation of different planets and also time and circumstances, there is nothing wonderful in the stories of the Purāṇas, nor are they imaginary. We should always remember the maxim that one man’s food is another man’s poison. We should not, therefore, reject the stories and histories of the Purāṇas as imaginary. The great ṛṣis like Vyāsa had no business putting some imaginary stories in their literatures.
Ref >> Srila Prabhupada Vani.