MEHAU KULYK / SCIENCE PHOTO LIBRARY MEHAU KULYK / SCIENCE PHOTO LIBRARY
Dark energy. Conceptual computer artwork of quintessence, a hypothetical form of dark energy that is thought to be driving the universe's expansion at an accelerating rate. Dark energy accounts for 70% of the total mass-energy of the universe and there are two proposed forms: the cosmological constant and quintessence. The cosmological constant fills space homogeneously whereas with quintessence, energy can vary in time and space.
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