Most of us don’t get to play with a HoloLens anytime soon, but some developers will have a chance to develop apps for it. Galaxy Explorer For HoloLens gives you an idea what you can do with a HoloLens. It lets you explore the planets and stars. This open source project is now available on GitHub.
As the above video explains, you can use this code as a starting point for your own project or to learn how to develop similar solutions for HoloLens. You can find out more here.