彗星G3 ATLAS在乌拉圭上空
(原标题: Comet G3 ATLAS over Uruguay)
2025-01-28
浏览次数: 19
彗星可以很大。当远离太阳时，彗星的大小通常是指它由冰和岩石组成的硬核，通常跨度为几公里，甚至比一个小卫星还小。然而，当靠近太阳时，这个彗核会喷射出尘埃和气体，并留下一条细长的彗尾，彗尾可以延伸到很长的地方——甚至比地球和太阳之间的距离还要长。图中，C/2024 G3 （ATLAS）的彗尾由反射阳光的尘埃和发光气体组成，其宽度是满月的几倍，在长时间的相机图像中看起来比肉眼更大。这张特色图片显示了大约一周前在乌拉圭圣何塞的塞拉斯德马霍马山脉的树木和草地上令人印象深刻的阿特拉斯彗星。在地球南半球日落的天空中，G3 ATLAS彗星在逐渐远离太阳的过程中逐渐消失，这使得它令人印象深刻的彗尾越来越难以看到。图集：彗星ATLAS （G3）
查看原文解释
Comets can be huge. When far from the Sun, a comet's size usually refers to its hard nucleus of ice and rock, which typically spans a few kilometers -- smaller than even a small moon. When nearing the Sun, however, this nucleus can eject dust and gas and leave a thin tail that can spread to an enormous length -- even greater than the distance between the Earth and the Sun. Pictured, C/2024 G3 (ATLAS) sports a tail of sunlight-reflecting dust and glowing gas that spans several times the apparent size of a full moon, appearing even larger on long duration camera images than to the unaided eye. The featured image shows impressive Comet ATLAS over trees and a grass field in Sierras de Mahoma, San Jose, Uruguay about a week ago. After being prominent in the sunset skies of Earth's southern hemisphere, Comet G3 ATLAS is now fading as it moves away from the Sun, making its impressive tails increasingly hard to see. Gallery: Comet ATLAS (G3)
© Mauricio Salazar