The Hindus view that the Universe has no beginning or end, but follows a cosmic creation and dissolution. Hindus are the only one who propounds the idea of life-cycles of the universe. It suggests that the universe undergoes an infinite number of deaths and rebirths. Hindus views the universe as without a beginning (anadi = beginning-less) or an end (ananta = end-less). Rather the universe is projected in cycles. Hindu scriptures refer to time scales that vary from ordinary earth day and night to the day and night of the Brahma that are a few billion earth years long.
According to Carl Sagan,
"A millennium before Europeans were wiling to divest themselves of the Biblical idea that the world was a few thousand years old, the Mayans were thinking of millions and the Hindus billions".
Continues Carl Sagan,
"… is the only religion in which the time scales correspond… to those of modern scientific cosmology."
Its cycles run from our ordinary day and night to a day and night of the Brahma, 8.64 billion years long, longer than the age of the Earth or the Sun and about half the time since the Big Bang". One day of Brahma is worth a thousand of the ages (yuga) known to humankind; as is each night." Thus each kalpa is worth one day in the life of Brahma, the God of creation. In other words, the four ages of the mahayuga must be repeated a thousand times to make a "day ot Brahma", a unit of time that is the equivalent of 4.32 billion human years, doubling which one gets 8.64 billion years for a Brahma day and night. This was later theorized (possibly independently) by Aryabhata in the 6th century. The cyclic nature of this analysis suggests a universe that is expanding to be followed by contraction… a cosmos without end. This, according to modern physicists is not an impossibility.