The Miura fold, a type of rigid origami that works by folding flat, rigid sheets with hinges, has a number of uses. For instance, It's great for folding a map, because Interdependence of folds means that it is very difficult to reverse them and the amount of stress place on the map, and can be used on solar panels that need to be folded and unfolded by automation, as deployment only requires one motor, and to transport materials for telescope lenses that originally would be too big to fly into space. Here's one schematic for duplicating the Miura fold (PNG), and a simplified version (YouTube). More information and fun with scientific origami at Robert J. Lang's origami website.
The solar system's solid surfaces stitched together. If you want some more detailed imagery, you can always browse around NASA's planetary photojournal archive.
Chandra Sky Map - Joe DePasquale runs through the process of creating the map and some helpful tips for using the interactive tool.
Samuel Aston Williams shows maps of the spread of urban sprawl in several American and international cities over 30 years, as seen from space.
Some Google Earth enthusiasts have found a strange and unexplainable grid pattern in the middle of China's Gobi Desert.
The official Google Earth plugin is one free download that makes all sorts of cool stuff possible in your browser. There's a full screen version of the program (complete with underwater views and 3D buildings) which can be searched by entering queries at the end of the URL. There's a framed version with support for layers, historical imagery, day/night cycles, and the Google Sky starmap. Less useful but more fun are Google's collection of "experiments" demonstrating the possibilities of the Earth API, including a "Geo Whiz" geography quiz, an antipode locater, a 3D first-person view of San Francisco, a virtual route-follower, and MONSTER MILKTRUCK!, a crazy fun driving simulator that lets you careen a virtual milk truck through the Googleplex campus, ricochet off the Himalayas, or explore any other place you care to name. Lots more can be found in the Google Earth Gallery -- highlights include a look at mountaintop removal mining, a real-time flight tracker, a guide to trails and outdoor recreation, a 360 panorama catalog, geotagged Panoramio photos, and the comprehensive crowdsourced Google Earth Community Layer. And while it's too large to view online, don't miss loading the Metafilter user location map into a desktop version of Google Earth! [more inside]
NASA's MESSENGER team (previously: 1, 2, 3), with help from the U.S. Geological Survey, released yesterday the first global map of the planet Mercury. [more inside]