保护地球，探索宇宙，发现文明
2022年7月26日 Comet NEOWISE Rising over the Adriatic Sea Video Credit & Copyright: Paolo Girotti Explanation: This sight was worth getting out of bed early. Two years ago this month, Comet C/2020 F3 (NEOWISE) rose before dawn to the delight of northern sky enthusiasts awake that early. Up before sunrise on July 8th, the featured photographer was able to ca...
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 summer when illuminated by sunlight from below. Noctilucent clou...
2021年7月24日 The Edge of Space Image Credit & Copyright: Ralf Rohner Explanation: Where does space begin? For purposes of spaceflight some would say at the Karman line, currently defined as an altitude of 100 kilometers (60 miles). Others might place a line 80 kilometers (50 miles) above Earth’s mean sea level. But there is no sharp physical boundar...
2021年06月19日 Northern Summer Twilight Image Credit & Copyright: Justin Anderson Explanation: Nights grow shorter and days grow longer as the summer solstice approaches in the north. Usually seen at high latitudes in summer months, noctilucent or night shining clouds begin to make their appearance. Drifting near the edge of space about 80 kilometers above...
2020年7月13日 Comet NEOWISE Rising over the Adriatic Sea Video Credit & Copyright: Paolo Girotti Explanation: This sight was worth getting out of bed early. Comet C/2020 F3 (NEOWISE) has been rising before dawn during the past week to the delight of northern sky enthusiasts awake that early. Up before sunrise, the featured photographer was able to capture ...
2020 June 19 The Veins of Heaven Image Credit & Copyright: Ruslan Merzlyakov (RMS Photography) Explanation: Transfusing sunlight through a darkened sky, this beautiful display of noctilucent clouds was captured earlier this week, reflected in calm waters from Nykobing Mors, Denmark. From the edge of space, about 80 kilometers above Earth’s surface...
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, Sweden. From the edge of space, about 80 kilometers above Earth...
2019 June 26 夜光云、倒影与剪影 影像来源与版权: Peter Simmering 说明：有时候地面上是夜晚，但天空中是白天。当地球自转遮挡了太阳时，日落便从地面升起。因此，在地面上的日落时分，阳光仍然照耀着天空中的云层。在通常情况下，我们可以看到美丽的落日，但不同寻常的夜光云漂浮得如此之高，以至于在天黑后还能看到。夜光云通常太过黯淡而不会被人们看到，它们可能在夏季日落之后、当阳光从下方照耀时，才能显现出来。夜光云是已知最高的云层，它被认为是极地中间层云的一部分。这幅特征影像拍摄于两周之前，它呈现了荷兰.兹沃勒市北部遥远天空中的网状夜光云和一片小湖中的夜光云倒影，以及地平线上显著的树木剪影。这种异常明亮的夜光云不断出现在北欧的大部分地区。关于夜光云的多数发现都来自于过去十年，而它们是如何形成和演化的...