
Ask Ethan: Why does Dark not matter about collapse due to gravity? | By Ethan Siegel | Start with an explosion! | February 2025
Galaxies can be found throughout the cosmic filaments. There are often neutral and ionized matter within the halos of these galaxies, as well as along their line of views, so when that light comes, those absorption characteristics seen in their spectra can tell us what the density and the matter temperature. Its own circumgusting means,…