Gaia Sky is an open-source astronomy visualisation desktop and VR program with versions for Windows, Linux and macOS.

It is created and developed by Toni Sagristà Sellés in the framework of ESA's Gaia mission to create a billion-star multi-dimensional map of our Milky Way Galaxy, in the Gaia group of the Astronomisches Rechen-Institut (ZAH, Universität Heidelberg).

It also works with virtual reality headsets through SteamVR,[3] is fully scriptable with Python[4] and features game controller support that makes it possible to operate it even with a racing wheel.

In order to use Gaia Sky, at least a download of the base data package, containing the Solar System with low-resolution textures, is necessary.

Gaia Sky offers a built-in download manager which connects to the servers at the Astronomisches Rechen-Institut in Heidelberg to fetch the desired datasets.