I might be having a dull-minded moment but...

When an Objective card states "Place all Obstacles" does this still only refer to the core set obstacles in the game?

I'm assuming I only add RitR/CC dust fields, grav rift, purgils or exogorths when explicitly told to. Yes?

Thanks!

Correct. 1 Station, 2 Debris Fields, 3 Asteroid Fields.