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

Scientists analyzed data from 7 million galaxies and stumbled upon a missing piece of the cosmic puzzle. Thanks to the ...

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

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

A distant galaxy that lay quiet for decades has suddenly stirred, lighting up in dramatic bursts that have caught astronomers ...

Scientists may have finally found the universe’s missing matter - hidden in invisible hydrogen gas far beyond galaxies.

Primordial black holes are the earliest black holes thought to exist, and they vanished almost as fast as they came into being. As Stephen Hawking predicted, black holes don’t only draw particles in, ...

A map of the cosmic microwave background radiation obtained by the Atacama Cosmology ... The discovery also may change what ...

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

Astronomers have detected a lone black hole drifting through the Milky Way—an unprecedented discovery made possible by ...

freeing the cosmic microwave background (CMB). Fifty million years or so later, gravity drove the formation of the first luminous objects – stars and black holes – which ended the dark ages and ...

Cosmic microwave background data support cosmology’s standard model but retain a mystery about the universe’s expansion rate.