Extend the scene on both sides, maintaining a more natural and distant curvature of the Earth. Smooth out the planet's curve so that it appears farther in the background, with a more gradual horizon. On both sides, continue the celestial backdrop with additional stars, galaxies, and cosmic details, keeping the lighting consistent with the existing sunset glow. Ensure the Earth's surface shows a balance of subtle clouds, city lights, and natural landmasses to enhance realism.