Brian Greene: Is our universe the only universe? Multiverse. NASA Gives Up on LISA : Cosmic Variance. Sorry to bump Julianne’s fun post further down the page, but lots of news today.
This particular piece of news is not fun: NASA is abandoning LISA, the planned Laser Interferometer Space Antenna, as well as IXO, an X-ray satellite observatory (formerly “Constellation X”). Steinn has some of the ugly details. From Universe to Multiverse.