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Besides the atoms that make up our bodies and all of the objects we encounter in everyday life, the universe also contains mysterious dark matter and dark energy. The latter, which causes galaxies to accelerate away from one another, constitutes the majority of the universe’s energy and mass.
Since its discovery in 1998, scientists have been proposing theories to explain dark energy. One theory is that dark energy produces a force that can be measured only where space has a very low density, like the regions between galaxies. A physicist has reproduced the low-density conditions of space to precisely measure this force.Image credit: Courtesy of Holger Müller
