Last week the European Southern Observatory (ESO) published a 9 giga-pixel image cataloging 84 million stars in the Central parts of the Milky Way. They even provided this image in a zoomable format at http://www.eso.org/public/images/eso1242a/zoomable/ . It's really cool, but I'm not particularly fond of the Flash Plugin that they've used. It's a little bit slugish, and IMHO something like Google
![Zoomable image with Leaflet](https://cdn-ak-scissors.b.st-hatena.com/image/square/07fa563a250f6607eeb0ebe3a5058bdbc80aaa82/height=288;version=1;width=512/https%3A%2F%2Fblogger.googleusercontent.com%2Fimg%2Fb%2FR29vZ2xl%2FAVvXsEjPtQ2DzcY3zkLhnd7TEWjeW8wSKSOkGZ3xrBhHTxLhWpdzxluV6fZN4_tAuqm8Rkhd1o6PaVKfKf0gYkqZ2gEg_Qz2Xeri9R6uPCj3aIjK5RPD3ak8APRn_Fjuppm9_2PWgZNmST5JGtQ%2Fw1200-h630-p-k-no-nu%2Feso1119a_small.jpg)