Here is a bit more background on the strongest theories in regards to the subject:

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Modern science provides a humbling perspective. Our lives, indeed even that of the human species, are just a blip compared to the Earth, at 4.5 billion years and counting, and the universe, at 13.7 billion years.

It now appears the entire cosmos is living on borrowed time. It may be a blip within a much grander sweep of time. When, we now ask, will time end?

Our lives are governed by cycles of waking and sleeping, the seasons, birth and death. Understanding time in cyclical terms connects us to the natural world, but it does not answer the questions of science.

What explains Earth’s past, its geological eras and its ancient creatures? And where did our world come from? How and when will it end? In the revolutions spawned by Copernicus and Darwin, we began to see time as an arrow, in a universe that’s always changing.

The 19th century physicist, Ludwig Boltzmann, found a law he believed governed the flight of Time’s arrow. Entropy, based on the 2nd law of thermodynamics, holds that states of disorder tend to increase.

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