Dark energy, the unidentified force that’s pushing the universe to expand at ever faster rates, was already at work as early as nine billion years ago, scientists reported last week. New Hubble Space Telescope sightings of distant supernova explosions support the explanation of dark energy as energy of the vacuum whose density has stayed constant throughout the universe’s history, the scientists said.
Davide Castelvecchi | Physics, astronomy, and mathematics writer
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