You have a point there. It has only one moon!
I knew Duo was out of this world!
I don't understand the sentence. The sky is the sky. How can it have a possessive or non possessive pronoun?
For example, if you move to a different part of the planet, you see different constellations. And you might say to your friends, I can't live there, it's not our sky.
Is that a Ukrainian expression? I've never heard anyone day that.