Our universe is full of mysteries, but few are as perplexing as the dark, tiny galaxies that hover around larger ones like ...

Scientists know that the elusive substance called dark matter makes up most of all the matter in the universe, but have never ...

Out of all the matter in the universe, only 4% of the universe’s mass is currently understood — leaving 96% to be further ...

No theory could explain the slight excess of far-ultraviolet light in the Milky Way until now.

A tiny object half a universe away, a scar in a stream of stars circling the Milky Way, and an unusual star cluster in a ...

Galaxies, including the one we call home, are within halos of dark matter. But what exactly dark matter is remains something ...

By tracking individual stars and exploding supernovas, astronomers discovered the strength of early ultraviolet glow ...

A new study suggests that failing to detect dark matter signals in some galaxies may not contradict evidence seen in our own.

Dark matter doesn’t emit, absorb, or reflect light. It’s invisible but supposedly makes up 85% of the universe’s mass. Because it’s so abundant, astronomers believe it should explain many unsolved ...

Only about 5% of the universe is composed of normal matter that we can directly observe, while the remaining 95% is widely ...

Researchers may have identified what could be a compelling clue in the ongoing hunt to prove the existence of dark matter. A mysterious diffuse glow of gamma rays near the center of the Milky Way has ...

The first time I heard about galaxies without dark matter, I was sitting in my very first graduate class at the University of São Paulo. It was 2018, and the discovery had just been announced. A team ...