Only accounts for 5 percent of the universe. Another 25 percent is "dark matter," an unknown substance we can't see but which we can detect through how it affects normal matter via gravity. The remaining 70 percent of the cosmos is made of "dark energy," which is believed to be making the universe expand at an ever-increasing rate.
Our results show it may be a hypothetical vacuum energy first proposed by Einstein - or it may be something stranger and more complicated that changes over time.
This implies that something quite similar to Einstein's cosmological constant may exist after all - something we now call dark energy.
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