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]
Passage of the International Space Station and Discovery, taken on February 28th 2011 at 17:58UT from the area of Weimar, Germany. The shooting equipment is described in detail in this page. (Flash 10 required)
"Somewhere on the planet are ten-year-olds who, someday, will be the first people to set foot on Mars" 300 scientists and space-experts contributed to what's billed as "a realistic vision of the first Human Mission to Mars" -- Race to Mars. Discovery Channel Canada used Hollywood special effects, but for added realism rather than ray-guns and aliens. On the website, you can argue about whether they got it right. www.racetomars.ca
Here are some beautifully rendered views of polytopes, and a few more. The rendering program, Jenn 3D, is free and downloadable, (OS X, Linux, Win) and includes some really dazzling fly-about and camera effects as well as tons of high-dimensional models to explore. There's also a mind-boggling possibility of playing Go on boards in projective space. Via the Math Paint blog, which leads to other interesting places...
J-Track 3D is an interesting JAVA web-app offered by NASA which gives a 3D interactive display of over 500 satellites currently orbiting the Earth.
3-D Maps of Nearby Space "The first detailed map of space within about 1,000 light years of Earth places the solar system in the middle of a large hole that pierces the plane of the galaxy...The new map, produced by University of California, Berkeley, and French astronomers, alters the reigning view of the solar neighborhood." (one view|another view|links to bigger images)
Space Station*, the first 3D IMAX film, opens this week in the US, next week in the UK. Tom Cruise narrates. Hanks must have been busy.