At the end of one thousand Maha Yugas, which is one day of the life of the world, the great god Vishnu will take on the form of Shiva-Rudra and will destroy all life on earth.
First, he will enter the sun’s rays and intensify them for one hundred years, causing great heat to evaporate all water on the face of the earth.
All three worlds—heaven, earth, and the Underworld-will burn up from this intense heat.