Need some Requiem clarificaton! Thanks

Hey all - ok, just started Mission 4…question: beginning of game, as you are hurtling toward Requiem, the planet is ‘tron like’ and futuristic looking.

Now, in Missions 2, and 3, you are inside the planet, so the futuristic look continues, which makes sense - matches what you saw in Mission 1

Mission 4, you are transported to the surface, which is very Earth like

Only problem, in Mission 1, it appeared very Unearth like - so what gives? What did I miss?

Thanks