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Satyug (Krithayug) will come after about 2000 years. Then comes the Kritha yug 125000 years), Dwapara Yug(63000 years), Threths Yug (32000)and Kaliyug (8000 years) again and again.
It is believed that 3 cycles of the four yug s have been completed. @ more cycles are due. Then the non existence of the Solar system.