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Are there even preliminary ideas about what dark energy is?

David Michel, Kettering, Ohio
RELATED TOPICS: DARK ENERGY
cosmic expansion
The term dark energy refers to whatever is causing the universe’s expansion to speed up. Two groups of scientists announced this result in 1998, and the team leaders won the Nobel Prize in physics in 2011. We call it “dark” because we can’t see it, and we call it “energy” because we think it fuels the expansion of the universe.

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