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According to the scriptures, there are yugas in these worlds. After completion of one yuga, the world collapses even an ant cannot escape from death but according to the history we find so many temples today in India which are built in dwapara yuga and also in thretha yuga.
As an example 'Kedharnath temple' was built by Pandavas i.e in the Dwapara yuga. Then how come these temples exist even till today? Can anyone please explain?
World does not collapse after every Yuga.
The collapse of earth & solar system only occurs at end of 1000 Chatur-Yugas (1 chatur yuga = krita + treta + dwapara + kali yuga = 4.32 million years)
And that too is only partial because higher worlds like Satya loka will still exist as long as Brahma lives, whose life-span is 100 years, where each year has 360 days, and each day = 2000 Chatur-Yugas (1000 daytime, 1000 nighttime)
After Kali Yuga ends (4 lakh+ years from now), there will be a period of prolonged rains, and then Krita Yuga will start all over again.
The age of earth can be easily calculated as one-daytime of Brahma = 1000 * 4.32 million, or 4.32 billion years.
Scientific analysis of carbon dating rocks comes pretty close to this value (4.54 ± 0.05 billion years). Over time science might get more refined and arrive at same answer as given in our ancient scriptures.
According to the scripture, at the transition of every Yuga-s, the world doesn't collapse always. Mainly "Morality" or Dharma in general, would become weaker. As discussed in this answer, Morality looses its 1-1 leg with every Yuga change from:
Krita --> Treta --> DwApara --> Kali ... <morality restored>
Now, according to a source in this answer, at the end of a Kaliyuga, all creation will happen afresh. Hence, the possibility of big annihilation (MahA-pralaya) is during one particular Kaliyuga.
In general, it's better to avoid Yuga theory, because there are too many theories around it. The world is so big and diverse that we can't say for sure that which country is living in which Yuga, as per Dharma. Some countries practice higher morality and some lower.
