Expansion of universe measured in an era before dark energy takes over
For the past 5 billion years, the expansion of the universe has been powered by a mysterious repulsive force known as dark energy.
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For the past 5 billion years, the expansion of the universe has been powered by a mysterious repulsive force known as dark energy.
The case of the missing quasar gas clouds has been solved by a worldwide research team led by Penn State astronomers Nurten Filiz Ak and Niel Brandt.