2025年7月23日
Fireball over Cape San Blas
Image Credit & Copyright: Jason Rice
Explanation: Have you ever seen a fireball? In astronomy, a fireball is a very bright meteor — one at least as bright as Venus and possibly brighter than even a full Moon. Fireballs are rare — if you see one you are likely to remember it for your whole life. Physically, a fireball is a small rock that originated from an asteroid or comet that typically leaves a fading smoke trail of gas and dust as it shoots through the Earth’s atmosphere. It is unlikely that any single large ground strike occurred — much of the rock likely vaporized as it broke up into many small pieces. The featured picture was captured last week from a deadwood beach in Cape San Blas, Florida, USA.
Piece it Back Together: Astronomy Puzzle of the Day
Tomorrow’s picture: open space
圣布拉斯角上空的火流星
影像提供与版权: Jason Rice
说明: 你看过火流星吗？在天文学里，火流星是指非常明亮的流星，其亮度至少与金星相当，有时甚至胜过满月。火流星十分罕见，如果你有幸亲眼目睹，可能会终生难忘。以其物理本质来说，火流星是小岩块，起源于小行星或彗星，通常在穿过地球大气时，会留下逐渐消散的气体和尘埃流星迹。不过，它不太可能发生大型地面撞击，因为岩块在碎裂时会很快汽化。这幅主题影像是在上周摄于 美国 佛罗里达州圣布拉斯角枯木散布的海滩。
重新拼凑: 今日天文学谜题
明日的图片: open space
