In the mid-satya-yuga of the first maha-yuga of the present manvantara i.e., around 115 million years ago there lived a King of the Solar dynasty, by name Kakudmi, and his beautiful daughter Revati. Not trusting the astrologers of his time, yet believing in the maxim %u2018marriages are made in heaven%u2019 Kakudmi took his daughter to the celestial world of Brahma the Creator (Note: in every satya-yuga such journeys are supposed to be possible) in order to ask the Creator Himself as to who would be the right marital match for his daughter. Kakudmi had somebody in his own mind. But Lord Brahma was available to him only after a twenty minutes or so of waiting time (by the standards of that world). When Kakudmi finally had the opportunity to ask Brahma his question, Brahma laughed and said:
My dear Kakudmi, from the time you came here your earthly world has passed through 27 maha-yugas and so none of whom you have in mind or their descendents are alive now. Right now people are enjoying the avatara (=descent) of Lord Krishna on the Earth. Go back and marry off your daughter to Balarama, the elder brother of Krishna%u2019.
Thus it was that Kakudmi and Revati travelled %u2018back to their future%u2019 -- from the 1st mahayuga to the 27th -- and Revati was married to Balarama.
Note: 1 mahayuga = 43.2 %u2018seconds%u2019 for Brahma.
