Le site de vulgarisation scientifique de l’Université de Liège. ULg, Université de Liège
Dark energy

This is a form of energy about which we know nothing, except that it must exhibit a kind of negative pressure that allows it to act like a gravitational force, only one that is repulsive instead of attractive. Dark energy is supposed to be responsible for the acceleration of the expansion of the universe. Together with dark matter, dark energy makes up most of the matter in the universe.

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