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In Hindu cosmology, a Mahayuga is a "great age" composed of four smaller ages, or yugas: Krita, Treta, Dvapara, and Kali. Each yuga represents a progressive decline in humanity's moral and physical state. The Krita yuga was an age of perfection, while the Kali yuga is the current, most degenerate age, which began in 3102 BCE.12

These four yugas together form a Mahayuga, and 2,000 Mahayugas constitute a larger cosmic cycle called a kalpa. At the end of the Kali yuga, the world is destroyed and then recreated as the cycle begins anew. The concept of yugas reflects a cyclical view of time in Hinduism, where the universe undergoes repeated cycles of creation, destruction, and rebirth.13

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