Dark Energy from the Universe’s Bright Past
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.
[...] Just when the universe had barely begun to get us used to a new level of weirdness — what with the pervasiveness of dark energy, the anti-gravitational push that wasn’t even on the map until ten years ago — here comes a new, discovery that seems to contradict even the little we thought we knew. [...]
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