Extragalactic archaeology has come of age, with astronomers for the first time reconstructing the history of a spiral galaxy.

As their name suggests, ultradiffuse galaxies, or UDGs, are dwarf galaxies whose stars are spread out over a vast region, resulting in extremely low surface brightness, making them very difficult to ...

Disk galaxies, like our own Milky Way galaxy, commonly consist of both a thick and thin disk of stars—each with different features, including stellar population and movement. Three major theoretical ...

If you could step back a few quadrillion miles and look at the Milky Way from the outside, you’d see a magnificent, glowing pinwheel of stars and gas, its arms curving majestically outward from a huge ...

Magnetic fields that stretch across thousands of light-years should take a very long time to organize. Standard dynamo theory ...

The first time I heard about galaxies without dark matter, I was sitting in my very first graduate class at the University of ...

Astronomers have explained how a galaxy cluster maintains its heat, despite emitting X-rays that cool the hot gas at its center. The group discovered the existence of a fast-moving, high-temperature ...

Image of the irregular dwarf galaxy Sextans A, located at a distance of about 4 million light years from us, towards the edge of the Local Group, captured by the VST (VLT Survey Telescope), an Italian ...

Space is packed with all sorts of weird and unexpected stuff, but this humongous, spinning string-thing raises a whole new set of questions. Reading time 3 minutes Composite image showing the massive ...

Galaxy interactions can be dramatically violent. Minor mergers can cause the smaller galaxies to disappear into the larger ones. Major mergers can change the whole geometry of the galaxies involved, ...

Add Yahoo as a preferred source to see more of our stories on Google. NASA, ESA, Dayi Li (UToronto); Image Processing: Joseph DePasquale (STScI) The universe is overrun with dark matter, outweighing ...

Research, led by Gabriela Canalizo of the University of California, Riverside, points to a spectacular collision of galaxies RIVERSIDE, Calif. – New images taken with NASA’s Hubble Space Telescope – ...