Mysterious Hydrogen Gas Discovered: Half the Universe Found!

Surprising everyone in the astronomy community, the team revealed that the hydrogen gas forms a vast halo around galaxies, stretching up to five times farther than previously believed. This breakthrough—detected using the kinematic Sunyaev-Zel’dovich effect—could redefine how galaxy formation and cosmic evolution are modeled, making “universe map discovery” a hot topic in space science.
Astronomers find missing hydrogen gas—turns out half the universe was just really good at hiding.