From the Epic Store page:
"Outer Wilds is an open world mystery about a solar system trapped in an endless time loop.
Welcome to the Space Program!
You’re the newest recruit of Outer Wilds Ventures, a fledgling space program searching for answers in a strange, constantly evolving solar system.
Mysteries of the Solar System...
What lurks in the heart of the ominous Dark Bramble? Who built the alien ruins on the Moon? Can the endless time loop be stopped? Answers await you in the most dangerous reaches of space."