Looking around is free. Creating is what needs membership. The Mercury 91 universe is the 3D solar system you open in the browser: orbit planets, see others present, and read public stars and dreams. Creating and AI need membership at $3.99/month for new members. The interactive 3D universe page is the written guide.
This route is the app you enter. The interactive 3D universe page is the guide to planets, journals, and what membership includes. Open the guide when you want the explanation. Open this route when you want to go in and look around.
Looking around is free. Creating is what needs membership. There is no trial timer on looking around. Membership at $3.99/month for new members is what lets you create, save, own a planet, and use AI. Earlier lifetime buyers keep permanent access.