This is a video going out of bounds to show where the Outer Wilds devs hid the Sixth Location of the Quantum Moon.
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The Quantum Moon is supposed to be orbiting around the Eye of the Universe when it's at it's sixth location, however the Eye is located in a separate game scene so they had to hide it elsewhere.

Spoiler: the sixth location is just a distant orbit around the sun, and the Quantum Moon is just invisible if you aren't on it. If you are on it, then it doesn't matter because you can't see the planets through the clouds so you're none the wiser.

I used the FreeCam mod made by _nebula in this video, you can find the mod on outerwildsmods.com if you want to use it yourself!