Cosmonium is a free and open-source 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 and stellar system using procedural generation.

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 binary package for your platform and the textures packages from the Download page.

See Build to build Cosmonium from sources.

Cosmonium user interface is 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.

Cosmonium is still in its infancy, but it is already usable to explore the planets and the moons of our solar system, all the neighbor or visible stars. See the features page for a complete list.

Cosmonium is (C) 2018-2020 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 THIRD-PARTY.md 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.