Photorealistic cinematic science-fiction scene of a desert city street under a massive glowing plasma filament across the sky.

Photorealistic cinematic science-fiction scene viewed from the streets of a small isolated desert city, exactly as an ordinary citizen would see it during daytime. Above the city is the world's primary source of daylight and heat: an enormous, naturally occurring, electrically active plasma filament extending across the sky in an almost perfectly STRAIGHT LINE from one horizon to the opposite horizon. It is not a sun, not a star, not a planet, not a ring, and not a spacecraft. The filament is unimaginably long and distant. From the ground it appears as a gigantic luminous linear structure crossing the entire heavens. Its central core is intensely bright, producing warm natural daylight and realistic shadows, while its edges consist of countless thinner glowing plasma filaments and subtle irregular wisps. The overall structure remains fundamentally straight rather than curved. It should look like an enormous cosmic electrical current viewed from a planet. The plasma is luminous enough to provide the planet's daylight and radiant heat, but it does NOT resemble lightning. No branching lightning bolts, no lightning storm, no artificial energy beam. It is a vast stable astronomical phenomenon that has existed for ages. The city below is small, believable, elegant and grounded: desert architecture made from stone, ceramic, metal and practical materials, with no advanced electronic technology. Citizens casually go about ordinary daily life. Their clothing is beautiful, flowing and See more