Two fresh ideas are giving scientists new ways to think about how the universe’s hidden mass came to be. Together, they paint ...

Bold new theories on "mirror worlds" and how dark matter may have formed - from black hole relics to quantum horizons.

We usually think of satellites as small objects orbiting planets or stars. But in the broader universe, galaxies themselves ...

Most of what we know about satellite galaxies comes from studying the Milky Way and other similarly large galaxies. But a new ...

Science X is a network of high quality websites with most complete and comprehensive daily coverage of the full sweep of ...

Physicists detect antihydrogen-4, the heaviest antimatter nucleus ever created, fueling new theories about dark matter and ...

Celebrating Women Astronomers Day featuring women astrophysicists on the facultyAug. 1 is Women Astronomers Day, highlighting the historical ...

Our galaxy is being held together because dark matter is actively keeping everything "stuck". But how precise is this theory?

Astronomers have spotted two massive galaxies locked in a cosmic tug-of-war 700 million light-years from Earth — and for the ...

The theorists predict that the beginning of the end will be in about 10 billion years — less than the present age of the ...

The Vera Rubin Observatory sits atop the mountain Cerro Pachón in northern Chile.