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Cosmos Explorer is a fully client-side space encyclopedia featuring an interactive 3D Solar System orrery, detailed sections on planets, stars, black holes, galaxies, nebulae, cosmology, and space missions all enriched with smooth space-themed animations and a parallax starfield background. Instead of a sign-in page, it uses a Watchlist system powered by localStorage, letting visitors bookmark celestial objects, earn XP, and collect badges through an Astronaut Quiz no account needed. The site also includes an Astrophysics Simulation Suite with a gravity weight calculator, a cosmic scale explorer, a space gallery, and a shareable quiz certificate, making it both an educational resource and an interactive experience.