Expanding cosmos hints at new physics

A mathematical discrepancy in the expansion rate of the Universe is now "pretty serious", and could point the way to a major discovery in physics, says a Nobel laureate. The most recent results suggest the inconsistency is not going away. Prof Adam Riess told BBC News that an unknown phenomenon, such as a new particle, might explain the deviation. The difference is found when comparing precise measurements of the rate obtained in different ways.
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