People dressed in astronaut costumes and holding flags of China pose for pictures while visiting the Volcano No. 6 of the Ulan Hada volcano group near Ulanqab, Inner Mongolia Autonomous Region, China October 4, 2021. REUTERS/Carlos Garcia Rawlins

People dressed in astronaut costumes pose for pictures while visiting the Volcano No. 6 of the Ulan Hada volcano group near Ulanqab, Inner Mongolia Autonomous Region, China October 4, 2021. REUTERS/Carlos Garcia Rawlins

A woman dressed in an astronaut costume poses for pictures while visiting the Volcano No. 6 of the Ulan Hada volcano group near Ulanqab, Inner Mongolia Autonomous Region, China October 4, 2021. REUTERS/Carlos Garcia Rawlins

A person dressed in an astronaut costume takes the helmet off while visiting the Volcano No. 6 of the Ulan Hada volcano group near Ulanqab, Inner Mongolia Autonomous Region, China October 4, 2021. REUTERS/Carlos Garcia Rawlins

People walk dressed in astronaut costumes while visiting the Volcano No. 6 of the Ulan Hada volcano group near Ulanqab, Inner Mongolia Autonomous Region, China October 4, 2021. REUTERS/Carlos Garcia Rawlins

People dressed in astronaut costumes pose for pictures while visiting the Volcano No. 6 of the Ulan Hada volcano group near Ulanqab, Inner Mongolia Autonomous Region, China October 4, 2021. REUTERS/Carlos Garcia Rawlins