Cosmic expansion could soon reverse:

After nearly 13.8 billion years of nonstop expansion, the universe could soon grind to a standstill, then slowly start to contract, new research published in the journal Proceedings of the National Academy of Sciences: suggests.

In the new paper, three scientists attempt to model the nature of: dark energy: – a mysterious force that seems to be causing the universe to expand ever faster – based on past observations of cosmic expansion. In the concrete model, dark energy is not a constant force of nature, but an entity called quintessence, which can decay over time.

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