Published at LXer:
While it may not let you go where no man has gone before, Celestia is an amazing desktop application that lets you go anywhere in the known Universe.You can view any object in the Solar System, travel to distant stars, and even leave the Galaxy, traveling faster than the speed of light, viewing high-res images of objects millions of miles away.
[My Sister who is a teacher in L.A. uses this program in her classroom and turned me on to it, very cool. - Scott]
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