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AtlantiS writes:

Check out Celestia – it’s a complete free space simulation that lets you explore our universe in three dimensions. It has very cool add ons…you will love it. It has over 500,000 stars you can fly to, following the Voyagers on their tour etc. You can go back in time and follow the Tunguska meteor impact…or watch the comet impact on Jupiter. There are also cool download links for space ships and even a complete Star Trek/Star Wars/or alien universe you can download and discover it, the same way as Google Earth works…

After a quick play, looks like a bunch of fun, and could be a handy educational tool too. Wish I had more time to play with it – take a look if space is your thang, you won’t be disappointed. Also, if you really get into it, head over to the Celestia Motherlode for heaps of add-ons. Thanks AtlantiS!