People first spotted the noctilucent clouds a few years after the 1883 eruption of the Krakatoa super-volcano in Indonesia created spectacular sunsets from ash in the atmosphere.

• 人类首次观察到夜光云是在印度尼西亚的喀拉喀托超大火山1883年爆发数年之后，当时，剧烈上升的火山灰造成了壮观的日落天象。