天空

An illustration is shown which is a decision tree for identifying a light that might be seen in the sky. The background is gray, and the text is black in red-lined boxes. Please see the explanation for more detailed information.
图表展示了一个决策树的图示，用于识别天空中可能出现的光。背景为灰色，文本以红色边框方框呈现。有关更多详细信息，请参阅说明。