add dark galaxies — collections of stars so sparse and faint that they are all but invisible. An artist’s depiction of hydrogen gas observed in the galaxy J0613+52, with the colors indicating ...

Astronomers experienced that unusual horror when they recently observed the distant galaxy NGC 1277 and found it entirely devoid of dark matter. The stuff has, apparently, vanished into the ...

It shows a rotational structure but no visible stars. This characteristic aligns with the hypothesis of a dark galaxy, primarily composed of dark matter. Measurements indicate that unexplained ...

This dark matter detection method would hinge on two of these vast groupings of galaxies meeting and smashing into each other. As these galaxy clusters are packed with dark matter, astronomers ...

The galaxy and halo alike may be near-pristine relics that have scarcely changed from their formation billions of years ago. Most of its mass is thought to lurk in a surrounding halo of dark ...

A galaxy floating alongside our own some 380,000 light-years from Earth could offer fresh clues in the 90-year-long quest to determine the nature of dark matter, the invisible glue that holds ...

Here’s how it works. A gigantic blob of invisible dark matter has bent our galaxy out of shape, a new study suggests. Scientists initially believed that the Milky Way was a flat disk dominated ...

A new image taken by the Dark Energy Camera shows a “galactic onion,” a shell galaxy with multiple layers that are spread out over a distance of 150,000 light-years. At around twice the size ...

Though galaxies are mostly made of dark matter, understanding how it is distributed within a galaxy offers clues to what this substance is, and how it's relevant to a galaxy's evolution.