The Multiple Identities of Omega Centauri
Omega Centauri is a huge globular cluster, so much so that some astronomers think it could be the remnant of a disrupted dwarf galaxy. We will see that this is not necessarily true.
Living the ‘Magellan’ life : Observing at a Chilean masterpiece
Unlike most astrophysicists today, this one did go observing for a change. And what he finds there is out of this world. Literally.
The ‘Ultimate’ X-ray Sky Survey: Finding Active Galaxies in Superclusters
The XXL Survey is here as the rightful successor to the XMM-Newton survey that gave us a unique and extravagant look into the high-energy universe. Here, we look at some of the observations that the XXL has to offer!
Conducting cool-core clusters: how black holes orchestrate their surroundings
The “cooling flow” problem has taxed the minds of astrophysicists for decades. Now, modern simulations are able to shed light on the problem.
Galaxy Groups and Clusters: Bristling with Satellites, Mostly Red
How do galaxy clusters form and evolve? Counting galaxies of different luminosities, masses, and colors can yield surprising insights.
A long-awaited discovery
More than 50 years ago, a Norwegian astronomer named Sjur Refsdal outlined an interesting new method for calculating the Hubble constant. Last November, astronomers found the perfect test case.