Einstein's cosmological constant is a leading candidate for the "dark energy."

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Einstein's cosmological constant is a term that can be added to Einstein's field equations in general relativity in order to account for a repulsive force that counters the gravitational attraction of matter. This term is one possible explanation for the observed accelerated expansion of the universe, which in turn is attributed to the mysterious "dark energy." Einstein's cosmological constant is a component of the equations describing the behavior of the universe, and is a possible explanation for the observed acceleration of the universe's expansion, which is attributed to "dark energy."

Einstein's Cosmological Constant Is a Leading Candidate for the "Dark