A new measurement of the Universe has confirmed dark energy makes up close to 69 percent of the sum of everything.
One tried and true way to work out how much dark energy there is relies on clusters of galaxies. That's because they consist of matter that has come together under gravity over the lifespan of the Universe, around 13.8 billion years.
By comparing the number of galaxies in, and mass of, a cluster compared with numerical simulations, scientists can calculate proportions of matter and energy. "Because present-day galaxy clusters have formed from matter that has collapsed over billions of years under its own gravity,"of the University of California Merced,"the number of clusters observed at the present time, the so-called 'cluster abundance,' is very sensitive to cosmological conditions and, in particular, the total amount of matter."
But because most of the mass is supplied by dark matter, it's difficult to measure the mass of a galaxy cluster directly. Instead, the researchers determined the mass of galaxy clusters in their database, carefully analyzed using the
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