Cosmic voids — vast underdense regions, forming an essential feature of the cosmic web and occupying most of the volume of the Universe — could contain as much as 20% of the ‘normal’ matter (i.e. the matter that makes up stars, planets, gas and dust) in the cosmos, according to an international team of astronomers led by Dr. Markus Haider of the University of Innsbruck, Austria. This slab cut from the cube generated by the Illustris...
