Stream of stars in Andromeda satellite galaxy shows cosmic collision

The Andromeda Galaxy is surrounded by a swarm of small satellite galaxies. Researchers from the Niels Bohr Institute, among others, have detected a stream of stars in one of the Andromeda Galaxy's outer satellite galaxies, a dwarf galaxy called Andromeda II.

Inside the dark heart of a cosmic collision

Astronomers have combined infrared and X-ray observations from two space telescopes - Herschel and XMM Newton - to create a unique look at violent events within the giant galaxy Centaurus A.