Dark Energy Signs Seen in Giant Clusters and Voids - Clara Moskowitz

Space.com, August 4, 2008


Scientists have found more intriguing evidence for dark energy — one of nature's most befuddling phenomena.

Dark energy is thought to make up about 74 percent of the universe, while dark matter — a mysterious form of matter that scientists can only detect by noting its gravitational pull on things — makes up about 22 percent. That leaves only 4 percent of the universe composed of things we can see and touch: the normal protons, electrons and neutrons called baryonic matter.

Scientists don't know what dark energy is, but they observe its tugging effect, which causes the expansion of the universe to accelerate. Now they have seen this mysterious force in some of the largest known features of the cosmos, called superclusters and supervoids.

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