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Cosmonium is a 3D astronomy and space exploration program. With Cosmonium you can navigate in our solar system and discover all the planets and their moons. You can also visit the neighboring stars and discover the true size of our galaxy and the Universe.

Cosmonium supports (or will support) the creation of fictional planets, stellar systems nebulaes, ... using procedural generation.

Cosmonium also already supports some Celestia addons (though CMOD and CelX are not yet supported).


Cosmonium runs on Windows (Vista or above), Linux (CentOS 5, Ubuntu 14 or above) or macOS (mac0S 10.9 or above) with a graphic card supporting OpenGL 2.1 or better (OpenGL 4.5 is recommended) and at least 512MB of disk (up to 4GB if the HD and UHD textures are installed).


Download the installer or package for your platform from the download page and see the [[Installation]] page The package contains only low resolution textures, see here to install extra HD and UHD textures.


See in the Wiki some screenshots of the application with views of Saturn, Jupiter, Mars, the Moon, procedural planets, ...



Simply starts cosmonium from your application menu or from the cosmonium folder. See also the installation page for more options.

User interface

Cosmonium user interface is still heavily based on Celestia, most of the command and keyboard shortcuts work the same. Go to First steps to have an explanation of the basic command or see the Control page for an exhaustive list.

Full documentation

Cosmonium is still in its infancy, but it is already usable to explore all the planets and the moons of our solar system, all the neighbor or visible stars and much more. It also support custom content and addons, either as Cosmonium or Celestia addons.

The full documentation is available in the Wiki


If you encounter any problem to install or run Cosmonium, please don't hesitate to fill a bug report in the issue tracker here on Github.


Cosmonium is (C) 2018-2022 Laurent Deru.

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details, which you should have received along with this program. If not, request a copy from: Free Software Foundation, Inc. 59 Temple Place - Suite 330 Boston, MA 02111-1307 USA.

Cosmonium uses several third-party libraries which are subject to their own licenses, see for the complete list.

Cosmonium data (textures, models, orbital elements,..) come from many sources. Their respective copyright holder, license and reference are available in the info panel of the displayed object and in the related yaml file.

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