The best and most accurate observations that cosmologists have gathered over decades show that all the matter around us, every single atom we see anywhere in the cosmos, makes up just 5 percent of all that exists. Another 27 percent is dark matter, which holds galaxies together. And everything else - a staggering 68 percent of the universe - is dark energy, a force that is responsible for the expansion of the universe.
At a meeting of the American Astronomical Society earlier this month, researchers presented data a decade in the making from the largest and most uniform sample of supernovae ever collected. The data was part of the Dark Energy Survey, an international collaboration of more than 400 astronomers working together to unpick the mysteries of dark energy.
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