Celestia is a free-to-play simulation of our solar system. It uses the latest scientific data and computer graphics to provide the best user experience.

In Celestia, you can explore the Universe in three dimensions and view celestial objects from every angle.

From a single computer, you can access the same Universe on all your devices – there are no server-based limitations!

Our catalogues are constantly being updated with new content. 

Customize Celestia to meet your needs. Add new objects from many different sources and see how they interact with other objects in your Universe.

Celestia's database is expandable, so you can add your own objects and see how they interact with the rest of the Universe.

See objects on Earth in more detail than ever before, view Earth from any angle, and even control the camera.

Use Celestia as a planetarium and see accurate positions of celestial objects in the sky.