Astronomers Use Galactic Magnifying Lens to Probe Elusive Dark Energy

Astronomers employ a number of methods to study the geometry of the universe, which tells us something about the nature of dark energy—a mysterious force discovered in 1998 that speeds up the expansion of the universe, but about which little else is known. Uncovering the nature of dark energy, which makes up about 72 percent of all the mass and energy in the universe and will ultimately determine its fate, is one of the holy grails of modern-day cosmology...

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