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They excavated large caves in the hills in Western India which are mostly Chaitya and viharas.
In the early part of the 20th century, scientists still weren’t sure how old Earth is.
Nowadays, scientists use radiometric dating of various sorts of rock – both earthly and extraterrestrial – to pinpoint Earth’s age.
Scientists tried to determine Earth’s age via our planet’s layers of rock, which must have been built over time.Greek Ambassadors: Book: “Periplus of the Erythrean Sea”by an anonymous author, who was a Greek, settled in Egypton the basis of his personal voyage of Indian coast in about A. He gives valuable information about the Indian coasts.In addition to epigraphic and numismatic sources there are many other antiquarian remains which speak much about our past.They led to the discovery that certain very heavy elements could decay into lighter elements – such as uranium decaying into lead.Many independent measurements have established that the Earth and the universe are billions of years old.
Astronomers use the distance to galaxies and the speed of light to calculate that the light has been traveling for billions of years.