<p style="text-align: center;"></p> <p>Galaxies are social beasts that are mostly found in groups or clusters – large assemblies of galaxies that are permeated by even larger amounts of diffuse gas. With
<p>Two of ESA’s space observatories have combined to create a multi-wavelength view of violent events taking place within the giant galaxy of Centaurus A. The new observations strengthen the view
AAVSO Alert Notice 452<br /> Simultaneous observations of SU Aur and AB Aur requested for XMM-Newton<br /> February 8, 2012 <p>Dr. Hans Moritz Guenther, Harvard-Smithsonian Center for Astrophysics, has requested bracketing and simultaneous
<p>The flow of hot gas toward a black hole has been clearly imaged for the first time in X-rays. The observations from NASA’s Chandra X-ray Observatory will help tackle two
AAVSO <a href="http://www.alertpay.com/?z4aBg63WCsqAdDVxUFbWZQ%3d%3d">ALert</a> Notice 411:<br /> Request for observations of the blazar 3C 66A<br /> October 31, 2009 <p>Further to Alert Notice #353 (July 11, 2007), Dr. Markus Boettcher (OhioUniversity) requests optical observations