By observing the brightness of distant dying stars, astronomers have long come to believe that the expansion of the universe is accelerating. In fact, that apparent reality is deeply built into cosmological models: a mysterious force that influences the universe on the largest scales, dubbed dark energy, is believed to explain the acceleration.

However, not everybody agrees with this widely accepted scientific consensus. In a controversial new paper, published in the journal Monthly Notices of the Royal Astronomical Society, a team led by Yonsei University astronomer Young-Wook Lee argues that once we take into consideration the age of these dying stars, the expansion acceleration suddenly disappears.

In fact, Lee and his colleagues suggest the expansion started to decelerate 1.5 billion

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