Celestia is a real-time space simulation that lets you experience
our universe in three dimensions. You can travel throughout the solar
system, to any of over 100,000 stars, or beyond the galaxy. All
travel in Celestia is seamless; the exponential zoom feature lets you
explore space across a range of scales, from galaxy clusters down
to spacecraft a few meters across. A 'point-and-goto' interface
is used to navigate through the universe to the object you
want to visit.