Astronomers tallying up all the normal matter—stars, galaxies and gas—in the universe today have come up embarrassingly short ...

A new analysis of the sky has finally confirmed where the missing half of the Universe's visible matter has been hiding.

Astronomers have long struggled with a troubling puzzle: a significant portion of normal matter in the universe appeared to ...

Mysterious dark matter makes up 85 percent of matter in the universe, and of the remaining 15 percent, scientists couldn’t ...

The halo is more extended that astronomers originally thought, and contains enough hydrogen gas to resolve the problem of the ...

Astronomers have peered back in time to find what looks like a population of 'hidden' galaxies that could hold the key to unlocking some of the universe's secrets. If their existence is confirmed it ...

For decades, scientists have known that ordinary matter — everything made of atoms — accounts for just 15% of the universe’s ...

Scientists found the universe's missing baryonic matter as invisible hydrogen outside galaxies using a method called 'stacking' ...

Astronomers may have found the long-missing half of the universe's regular matter—and it appears to have been right under our ...

A new analysis of astronomical data suggests unknown physics is at work assisting dark energy in acting almost as "antigravity," undoing the work of gravity, which clumps together matter to build vast ...

Since the James Webb Space Telescope (JWST) began science operations, astronomers have observed galaxies that existed more ...

Everything We Knew About the Cosmos Might Be Wrong When analyzing these millions of luminous red galaxies ... microwave background is in the back of everything we see in the universe.