A faint aurora is seen from Bingshanliang scenic spot in Zhangjiakou, North China's Hebei province, on Sunday. Photo: Wang Jiamian/Caixin

An aurora shrouds the night sky with a pink hue in Zhangjiakou, Hebei, on Sunday. Photo: Wang Jiamian/Caixin

On early Sunday morning in Hami, Xinjiang, a magenta aurora is visible. Photo: VCG

A green aurora covers part of the Milky Way early Sunday morning in Hami. Photo: VCG

A dazzling aurora lights up with the sky near Chifeng, Inner Mongolia, on Saturday. Photo: VCG

The aurora borealis, or northern lights, are visible in a panoramic photo taken in Xilinhot, Inner Mongolia, in the early hours of Saturday. Photo: VCG

People watch the northern lights at Crosby Beach in Liverpool, England, on Friday. Photo: IC photo

The northern lights are seen above Crosby Beach on Friday. Photo: VCG

The northern lights appear above Kharkiv in northeast Ukraine on Friday. Photo: IC photo