Summary: I'm not sure I understand this one. Here's what I understand: there is a new way of measuring the presence of Dark Energy in our universe over time. It involves measuring the scatter of light through hydrogen clouds. The way quasars scatter through those clouds is very specific so it can be measured. It has helped to confirm that the early universe the Gravitational force dominated, causing a deceleration in the expansion of the universe, but then Dark Energy took over and the universe began the phase of rapid expansion we are currently in.
This new method is being employed by the members of BOSS team in the US.
BBC News: ion years into the past.
< http://www.bbc.co.uk/news/science-environment-20303592
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