Free, open source, Real-time 3D visualization of space.
Celestia is a real-time space simulation which lets you experience the universe in three dimensions. Celestia does not confine you to the surface of the Earth, it allows you to travel throughout the solar system, to any of over 100,000 stars, or even beyond the galaxy. Travel in Celestia is seamless; the exponential zoom feature lets you explore space across a huge range of scales, from galaxy clusters down to spacecraft only a few meters across. A 'point-and-goto' interface makes it simple to navigate through the universe to the object you want to visit.
Run from terminal : snap run celestia-daily.celestia-qt
To use Add Ons :
Create .celestia directory inside ~/snap/celestia-daily/current/ and copy celestia.cfg.
Rename celestia.cfg to .celestia.cfg
Open .celestia.cfg and find ExtrasDirectories [ "extras-standard" "extras"] and replace it with ExtrasDirectories [ "extras-standard" "extras" "~/.celestia"]