While No Mans Sky is very impressive it's still just one fake galaxy that only will have a 100,000 or so star systems. This is Space Engine. It is a complete 3D simulation of our entire Hubble Volume (Observable Universe) that features trillions upon trillions upon trillions of galaxies which you can visit every star, planet, moon, asteroid, comet in the entire cosmos. And best of all it's completely free. If you have any interest in Astronomy I implore you to check this amazing "game" out.
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