Running up that hill: are some galaxy clusters moving away faster than others?
We discuss a new way to test the cosmological principle using X-ray studies of galaxy clusters in this Astrobite.
An almost perfect Universe: the Planck 2013 release (II)
In today’s astrobite, we continue our overview of the papers from the Planck 2013 release. This time, we review papers XVII and XXIII, which discuss weak gravitational lensing of the Cosmic Microwave Background, and the isotropy of the Universe at the time this background radiation was emitted.