Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2005 August 21
See Explanation.  Clicking on the picture will download
 the highest resolution version available.

影像版權與提供: Peter Michaud (Gemini Obs.)

說明: 一朵怎會弄出這種形狀?上圖實際上是由數朵雲疊成一種引人注目的透鏡狀雲。正常情況下,空氣通常會水平移動,較少垂直運動。不過有時候,空氣遇到山脈丘稜,有可能會出現較強較穩定的垂直振盪。這個振盪氣柱頂部的乾空氣,會因溼度的不同而分層,每一層就是一朵含有飽含水氣的,它們合起來形成一個層次分明的透鏡雲。上面這張照片是上星期在美國夏威夷基亞山附近拍攝的。

明日的圖片: empty mars

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