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The cosmos is starting to look a bit weird. For a few years now, cosmologists have been troubled by a discrepancy in how fast the universe is expanding. They know how fast it should be going, based on ancient light from the early universe, but apparently, the modern universe has picked up too much speed — a clue that scientists might have overlooked one of the universe’s fundamental ingredients, or some aspect of how those ingredients stir together.
Now a second crack in the so-called standard model of cosmology may be forming. In late July, scientists announced that the modern universe also looks unexpectedly thin. Galaxies and gas and other matter haven’t clumped together quite as much as they should have. A few earlier studies offered similar hints, but this new analysis of seven years of data represents the cleanest stand-alone indication of the anomaly yet.
“If we were having conferences,” said Michael Hudson, a cosmologist at the University of Waterloo in Canada who is not involved in the research, “all the coffee chatter would be about these results.”
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Massive objects can distort light from distant galaxies, as seen in this illustration.
Sakkmesterke/Science Photo Library
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