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"This is the most distant supernova anyone has ever found for doing dependable cosmology," David Rubin, of the U.S. Department of Energy's Lawrence Berkeley National Laboratory and the University of California, Berkeley, said in a statement.
The most important unanswered question we have about the nature of dark energy is whether it varies over time — whether it affects the expansion of the universe differently in different eras," Rubin added. "With SN SCP-0401, we have the first example of a well-measured supernova sufficiently far away to study the expansion history of the universe from almost 10 billion years ago