each made of 14 Manvantara (1000) years. Each Maha Yuga lasts for 4,320,000 years. Manvantara is Manu's cycle, the one who gives birth and governs the human race.(Maha Yuga %u2013 the Satya Yuga (or Krita Yuga), the Treta Yuga, the Dvapara Yuga and finally the Kali Yuga)
Each Maha Yuga consists of a series of four shorter yugas, or ages. The yugas get progressively worse from a moral point of view as one proceeds from one yuga to another. As a result each yuga is of shorter duration than the age that preceded it. The current Kali Yuga (Iron Age) began at midnight 17 February / 18 February in 3102 BC in the proleptic Julian calendar.%u201D
For more information you can go to : http://www.encyclopediaofauthentichinduism.org/
Even NASA scientist are now referring Vedic scripture for cosmolofy and all other sciences fro our Vedas , and if people don%u2019t know they had hire Sanscrit expert for translation.
If our Culture has such mine of knowledge, so rather exploring them with available scientific methods why Congress Government trying to destroy our culture. Instead we have to try to establish with carbon technology or any suitable method. Its God wish that in kaliyug most of people forget Vedic knowledge or even God and so that is why Islamism attacked our country then British so we gone away from our religion.
But my friends we are on golden age of Kaliyug (First 10,000 years- another around 100,000 years remain of Kaliyug then Kalki Avtar will happen) and its our duty to save