A strange, starless cloud on the edge of a nearby galaxy is forcing astronomers to confront one of the biggest unknowns in physics. The object, nicknamed Cloud‑9, looks like a wisp of hydrogen gas, ...

Astronomers have spent decades hunting for dark matter by looking for light that isn’t there — and that strategy has mostly failed. Now, a team of researchers has tried something radically different.

Seeing is not believing when it comes to dark matter. Scientists have blown stargazers’ collective minds after discovering a massive dark object in space that’s completely invisible to the naked eye, ...