The Universe According to Planck
The Planck satellite has completed its mission to map the entire microwave sky at nine separate frequencies, with a second data release occurring in early 2015. Analysis of Planck data has resulted in more than 100 papers, covering many different aspects of the cosmic microwave background (CMB). We have been able to learn in detail about the physics of the interstellar medium in our Galaxy, and to remove this foreground emission in order to extract the cosmological information from the background radiation. Planck’s measurements lead to an improved understanding of the basic model that describes the Universe on the very largest scales. In particular, a 6 parameter model fits the CMB data very well, with no strong evidence for extensions to that model. There are constraints on inflationary models, neutrino physics, curvature, dark matter and dark energy, and many other theoretical ideas. New cosmological probes include CMB lensing,CMB-extracted clusters of galaxies and constraints on large-scale velocities. The Planck Team is preparing for a further data release in 2016, focused on a more complete analysis of the polarization data.