Vertical 9:16 portrait phone wallpaper, original AI sci-fi art: a lone astronaut in a white spacesuit kneeling on the grey Moon surface gently planting a tiny glowing green sapling in moondust, a small glass dome greenhouse beside them, exactly one single planet Earth rising low over the lunar horizon in a black starry sky, no other planets in the sky, footprints trailing behind, vertical composition, cinematic and hopeful, no text, no watermark, no logo, no celebrities