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Most researchers have assumed that the stars have somehow accelerated – or that, more precisely, the rate of the expansion of the post-Big Bang universe itself has accelerated over time.
Now, a group of scientists from the University of the Basque Country in Bilbao, and Spain's University of Salamanca have offered a different idea. Maybe it's the passage of time itself that's slowing down, they say. The distant galaxies only look like they're accelerating because our deep-space telescopes are essentially looking back in time to see them, to when time was going faster.
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