According to the model, dark matter may have started as particles that were hot, light, massless, and fast. As the universe ...

Astronomers have detected one of the darkest objects ever seen at a record cosmic distance—only with the assistance of gravity. The discovery is an important step toward the observation of dark matter ...

The story begins with the black hole information paradox. According to relativity, anything that falls into a black hole is ...

A team of astronomers have found a mysterious object in the distant universe that could be dark matter or an inactive smaller, or dwarf, galaxy.

Astrophysicists have presumed for nearly a century that the universe will just keep expanding for all eternity, driven by an ...

Astronomy is, in essence, an exercise in inference. We cannot touch the stars, nor scoop up galaxies in a lab. Instead, we ...

Scientists found where the universe’s missing matter went. Black holes have been pushing it far away from galaxies.

Black holes are eaters of all things, even radiation. A new study published in Physical Review Letters suggests that black ...

For a quarter century, cosmology has leaned on one framework to explain how the universe expands. Known as the ΛCDM model, it assumes about 70 percent of the cosmos is filled with an unseen force ...

Dark energy—the term used to describe whatever is causing the universe to expand at an increasing rate—is one of the universe's greatest mysteries. The most widely accepted theory currently suggests ...