美国航天局说，在地球上稀疏的白色卷云是由冰晶所组成的。
On Earth, NASA says, white wispy cirrus clouds are made of ice crystals.
弗吉尼亚理工大学（Virginia Tech）的科技系教授，化学家亚伦•戈尔斯坦解释说，快速冷冻意味着冰晶根本来不及形成。
The quick freeze means ice crystals don't have as much time to form, explained Aaron Goldstein, a chemist and Virginia Tech professor.
媒体报道说，这可能是火焰彩虹，由阳光通过冰晶云折射后发生。
Media reports said it was likely a fire rainbow, which occurs when sunlight refracts through ice-crystal clouds.
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