太陽的分層白板動畫

A cutaway diagram of the Sun: a large glowing sphere with one quarter wedge cut away to reveal concentric layers from the centre outwards: a small bright white-yellow core at the centre, a wide radiative zone around it, a convection zone shown with looping swirling cells, and the thin bright surface (photosphere) on the outside. A soft faint corona glow surrounds the whole sphere. Exactly four inner layers plus the outer corona glow, nothing else in the picture, no labels. Plain dark-free background with lots of empty space, 4:3. Coloured pencil and watercolour marker, clean black ink outlines, warm off-white paper, no text.