Celestia is a very impressive, and free, planetarium that "Unlike most planetarium software, ... doesn't confine you to the surface of the Earth. You can travel throughout the solar system, to any of over 100,000 stars, or even beyond the galaxy." Also, unlike other planetarium software, it has a huge repository of optional add-ons that include Science Fiction worlds and vessels from Star Trek, Star Wars, Babylon 5, and others. I've recently been enjoying this software, though I haven't had time to read the manual, which is probably necessary. Still just using it to view the planets in the solar system in real time is interesting enough. Even just using it for its opening view of the Earth as it rotates in real time is worth the download.
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