A rare phenomenon of "light pillars" was seen beaming into the night sky in freezing Xinjiang, as the temperature dropped to -30 Celsius. The optical phenomenon happens when light is refracted by ice crystals. [Photo: Chinanews.com]"

A rare phenomenon of "light pillars" was seen beaming into the night sky in freezing Xinjiang, as the temperature dropped to -30 Celsius. The optical phenomenon happens when light is refracted by ice crystals. [Photo: Chinanews.com]"

A rare phenomenon of "light pillars" was seen beaming into the night sky in freezing Xinjiang, as the temperature dropped to -30 Celsius. The optical phenomenon happens when light is refracted by ice crystals. [Photo: Chinanews.com]"

A rare phenomenon of "light pillars" was seen beaming into the night sky in freezing Xinjiang, as the temperature dropped to -30 Celsius. The optical phenomenon happens when light is refracted by ice crystals. [Photo: Chinanews.com]"

A rare phenomenon of "light pillars" was seen beaming into the night sky in freezing Xinjiang, as the temperature dropped to -30 Celsius. The optical phenomenon happens when light is refracted by ice crystals. [Photo: Chinanews.com]"