Gemma 4 Challenge: Build With Gemma 4 Submission This is a submission for the Gemma 4 Challenge: Build with Gemma 4 What I Built StarLens — an AI-powered night sky companion where Gemma 4 is the protagonist, not a bolt-on. StarLens computes the real-time positions of 118,000 stars, 8 planets, the Sun, and Moon using NASA/JPL ephemeris data (Skyfield + Hipparcos catalog), then feeds that data into Gemma 4 so every answer is grounded in actual science — not hallucination. It features 7 interactive tabs , each showcasing a different Gemma 4 capability: 🌌 Tonight's Sky — Real-time sky map with Gemma narration. Tap any object and ask "Why is it there?" — Gemma explains the orbital mechanics. 💬 Sky Chat — Multi-turn conversation with the full sky state injected as context. Ask "What's that bright thing in the south?" and Gemma looks up the real computed positions. 🚀 Guided Tour — Gemma leads you through the sky step-by-step with exact directions, altitudes, and surprising facts — like a live planetarium show.…