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原文:
If seen in the right light, Saturn glows like a neon sign. Although Saturn has comparatively little of the element neon, a composite image false-colored in three bands of infrared light highlights features of the giant ringed planet like a glowing sign. At the most blue band of the infrared light featured, false-colored blue in the above image, Saturn itself appears dark but Saturn’s thin rings brightly reflect light from our Sun. Conversely, Saturn’s B ring is so thick that little reflected light makes it through, creating a dark band between Saturn’s A and C rings. At the most red band of the infrared, false-colored red above, Saturn emits a surprisingly detailed thermal glow, indicating planet-wide bands, huge hurricane-like storms, and a strange hexagon-shaped cloud system around the North Pole. In the middle infrared band, false-colored green, the sunlit side of Saturn’s atmosphere reflects brightly. The above image was obtained in 2007 by the robotic Cassini spacecraft orbiting about 1.6 million kilometers out from Saturn. Follow APOD on: Facebook, Google Plus, Twitter, or Instagram
中文翻譯:
如果在合適的光線下，土星如同霓虹燈般閃耀。雖然土星的氖元素相對較少，但這幅以三個紅外光波段合成的假色圖像突顯了這個巨大環行星的特徵，如同發光的標誌。在紅外光波段中，假色藍的部分，土星本身顯得較暗，但土星的細環卻強烈反射來自太陽的光線。相反地，土星的B環厚度如此之大，以至於很少有反射光能穿透過去，形成了土星A環和C環之間的暗帶。在最紅的紅外波段（假色紅），土星發出驚人的詳細熱輻射，顯示出全球性的條帶、巨大如颶風般的風暴，以及環繞北極的奇特六邊形雲系。在中間紅外波段（假色綠），土星的大氣日照面則強烈反射出光線。上述圖像是由機器人太空探測器卡西尼（Cassini）於2007年拍攝，距離土星約160萬公里。
#土星 #卡西尼 #太空探索 #紅外線成像 #行星科學 #天文學 #美麗的宇宙 #六邊形雲系 #環行星
來源:NASA每日圖片
