Noctis

Noctis: the latin word for "night", and the title of this simulator. Night, after all, is just the word we use to describe the absence of light while the Earth is turned away from the sun, and in space, there is no light but the distant pinpricks of ancient stars. Space is a lonely place, but it harbours some truly spectacular secrets; eerily glowing pulsars, enormous red giants, glittering, beautiful nebulae, and deadly, all-consuming singularities to name but a few. For most people, the thought of going into space and exploring such sights is an impossible dream. But no longer; Noctis allows you to do just that. In technical terms, it is a fully 3D galaxy, which allows you to explore thousands of stars, their planets and moons. From the moment you first play Noctis, you'll be hooked.

Source:

Quote from Ryan J. Bury at the Noctis Homepage