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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

1:51pm, December 15, 2008

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

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. By combining the new data with that from several other studies, the team finds that dark energy appears to have maintained the same density over time, resembling Einstein’s cosmological constant.

Some theories of dark energy suggest that the repulsive force associated with this mystery substance may grow stronger with time, causing the universe to end in a Big Rip

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