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Dark energy constantly with us

New observations about the density of galaxy clusters through time suggest dark energy’s strength has been a constant

By Ron Cowen

- More than 2 years ago

VANCOUVER, Canada — Chalk up another victory for the dark side.

DARK INFLUENCE X-ray observations of massive clusters of galaxies, as seen by NASA’s Chandra X-ray Observatory, show the fingerprints of dark energy. A. Vikhlinin et al., Chandra X-ray Center, NASA

Comparing X-ray observations of distant and nearby clusters of galaxies, astronomers say they have found new, independent evidence for the existence of dark energy, the mysterious entity that is accelerating cosmic expansion.