A strange, starless cloud on the edge of a nearby galaxy is forcing astronomers to confront one of the biggest unknowns in ...

Astronomers have identified Cloud 9, a nearby dark matter halo filled with gas but no stars. The discovery supports key predictions about how galaxies form and why some never do.

Two galaxies that are curiously lacking in dark matter — the most abundant matter in the Universe — might have formed when a collision between dwarf galaxies separated ordinary matter from its dark ...

The search for dark matter – an unknown and invisible substance thought to make up the vast majority of matter in the universe – is at a crossroads. Although it was proposed nearly 70 years ago and ...