Galactic Sheets Sizomes in Fuhnehtik Inglish iz GaLLaktik WahLz Syzohmz

Galactic Sheets

With lengths and breadths of hundreds of millions of light years but thicknesses of only ~20 million light years, galactic sheets (also known as great walls) are some of the largest known structures in the Universe. They consist of huge aggregates of galaxies (groups and clusters as well as isolated galaxies), and give the Universe the ‘honey-comb’ appearance evident in the following figures.