If not in visible stars and galaxies, the most likely hiding place for the matter is in the dark space between galaxies.

In 1929, Edwin Hubble discovered from observations of distant galaxies that the Universe was expanding. This baffled astronomers and the public alike. Then in 1998, another wrinkle: Two different ...

Cosmic inflation tries to describe one brief but crucial phase in the Big Bang that launched the universe onto its expansion course. Many textbooks and science educators have attempted to describe the ...

Dark matter is understood to interact “feebly” with the visible universe, but was that always true? Physicists have modeled the inflaton—a theoretical space scientists use to examine the period ...

Astronomers analyzing Sloan Digital Sky Survey data stumbled onto something they weren’t expecting: a structure stretching across 1/15th of the observable universe. Named the Great Arc, it spans more ...

A few hundred million years after the Big Bang, a thick fog of hydrogen gas shrouded the newborn universe in darkness. Stars had begun to form in the densest clumps, but the surrounding gas muffled ...

Scientists debate whether this object is the brightest in the visible universe, as a new study suggests. By Dennis Overbye Astronomers claimed on Monday that they had discovered what might be the ...

"Icarus," located in a remote galaxy in Leo, is the most distant star yet seen. It lies more than halfway across the visible universe. NASA / ESA / P. Kelly, Univ. of Minnesota We've got a new ...

Alfredo has a PhD in Astrophysics and a Master's in Quantum Fields and Fundamental Forces from Imperial College London.View full profile Alfredo has a PhD in Astrophysics and a Master's in Quantum ...

Cosmic inflation tries to describe one brief but crucial phase in the Big Bang that launched the universe onto its expansion course. Credit: Christine Daniloff / MIT / ESA / Hubble / NASA Many ...