Voids
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| definition | A large region of cosmic space without galaxies. The first of these voids to be discovered lies in the direction of Bootes and is some 300 million light-years across. It is estimated that voids take up about 98% of the volume of the Universe, with clusters of galaxies concentrated in the thin walls that surround them. | |||||||||||||||||||||
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| contributor | AAS_Frey.Katie_Admin original | |||||||||||||||||||||