下面的英仙座
(原标题: A Perseid Below)
2024-08-09
浏览次数: 20
地球上的居民通常通过仰望来观看流星雨。但这张由宇航员Ron Garan在2011年8月13日拍摄的非凡的照片，是通过向下看捕捉到英仙座流星。Garan站在轨道高度380千米的国际空间站上，从他的视角来看，英仙座流星雨扫过了斯威夫特-塔特尔彗星的尘埃。蒸发的彗星尘埃颗粒以每秒60公里的速度穿过地球表面上方约100公里的致密大气层。在这种情况下，缩短的流星闪光靠近画面中心，在地球弯曲的边缘和一层绿色气辉的下方，就在明亮的大角星下方。想抬头看流星雨吗？你很幸运，因为2024年英仙座流星雨现在很活跃，预计将在8月12日左右达到峰值。由于没有明亮的月光，今年你可能会在午夜后晴朗、黑暗的天空下看到许多英仙座流星雨。
查看原文解释
Denizens of planet Earth typically watch meteor showers by looking up. But this remarkable view, captured on August 13, 2011 by astronaut Ron Garan, caught a Perseid meteor by looking down. From Garan's perspective on board the International Space Station orbiting at an altitude of about 380 kilometers, the Perseid meteors streak below, swept up dust from comet Swift-Tuttle. The vaporizing comet dust grains are traveling at about 60 kilometers per second through the denser atmosphere around 100 kilometers above Earth's surface. In this case, the foreshortened meteor flash is near frame center, below the curving limb of the Earth and a layer of greenish airglow, just below bright star Arcturus. Want to look up at a meteor shower? You're in luck, as the 2024 Perseid meteor shower is active now and predicted to peak near August 12. With interfering bright moonlight absent, this year you'll likely see many Perseid meteors under clear, dark skies after midnight.