Copyright:
Jason Rice
中文翻譯:
你有沒有看過流星火球呢？在天文學中，流星火球是一種非常明亮的流星，它至少和金星一樣亮，甚至可能比滿月還要亮。流星火球非常少見，如果你看到過一次，你很可能會永遠記住它！流星火球實際上是一塊小石頭，它來自小行星或彗星，當它穿過地球的氣氛時，會留下漸漸消失的氣體和灰塵煙霧軌跡。通常來說，不太可能發生一個大型的墜地事件，因為這塊石頭在進入大氣時會分裂成許多小片，並且大部分可能已經氣化了。上面這幅圖片是在美國佛羅里達州的Cape San Blas的Deadwood Beach拍攝的，拍攝時間是上周。
原文:
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
來源:NASA每日圖片
