黑板粉笔太阳系示意画

A 3:2 horizontal classroom chalkboard illustration of the solar system. Draw the Sun and distinct planets with pastel chalk, curved orbit lines and tiny stars on dark green board. Rich powdery edges, coherent scale cues, friendly hand-drawn educational style. No labels, letters, numbers, dragon, mecha, logo or watermark.

在深绿黑板上以彩色粉笔绘制横幅 3:2 的太阳系课堂示意画。太阳与外观不同的行星、弧形轨道和细小星点构成清楚的整体，粉笔颗粒边缘丰富并保留手绘感。不加标签、字母、数字、机甲龙、商标或水印。