Data from the second and third year of the WMAP satellite experiment has just been released a few minutes ago. There a press release and other general information page. The scientific paper explaining what this new data tells us about cosmology is Three-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Implications for Cosmology. This is a good time to admit that I’m no cosmologist, and thus not the person to get information from about the significance of these results. However, I expect some of the earliest informed discussion of them should take place on various blogs, and I’ll be linking to those as I see them.
Update: Comments from Sean Carroll and Steinn Sigurosson. Discussion at CosmoCoffee and Bad Astronomy and Universe Today Forum. Also a posting from Lubos. I’m no expert here, but Lubos’s comments seem to me to be nonsense (I find it hard to believe that in the three-year data set they’re resolving structure 100 times smaller than in the first year, and I think he’s just completely wrong to say that this data rules out ekpyrotic or cyclic models).
Update: Christine Dantas also has more about this.
Update: Amazingly, Lubos still is maintaining that the 3 year results have 100 times better angular resolution than the 1 year results. This kind of fanatical inability to ever admit that one was wrong about something goes a long way towards explaining the current state of string theory.