极地中层云

巴黎上空的夜光云

作者： NASA中文 / 2022年7月12日

2022年7月12日 Noctilucent Clouds over Paris Credit & Copyright: Bertrand Kulik Explanation: It’s northern noctilucent cloud season. Composed of small ice crystals forming only during specific conditions in the upper atmosphere, noctilucent clouds may become visible at sunset during late summ […]

天文·每日一图

天空的脉络

作者： NASA中文 / 2019年7月26日

2019 July 26 The Veins of Heaven Image Credit & Copyright: P-M Hedén (Clear Skies, TWAN) Explanation: Transfusing sunlight through a still dark sky, this exceptional display of noctilucent clouds was captured earlier this month, reflected in the calm waters of Vallentuna Lake near Stockholm, Swe