APOD:2015.9.18

Sweet丿Kim (金) 天王星
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发表于:2015-09-24 12:44 [只看楼主] [划词开启]

冥王星的地貌 

影像提供:

NASA, Johns Hopkins Univ./APL, Southwest Research Institue

说明: 

这片带着阴影的壮丽山脉和冰原之原野,绵延向这颗遥远行星的地平线伸展。影像摄于7月14日当新地平线号通过最近点后的15分钟,回首眺望冥王星时的距离为18,000公里。


这幅精采、低角度的暮光景象,呈现了前景左侧称为Norgay Montes的崎岖山脉、地平线附近的Hillary Montes、及右侧平滑的史泼尼克平原。而在这幅背光的影像里,亦可见到冥王星稀薄大气的分层。这片奇特但看来熟悉的冻原,可能有氮冰和干冰,以及高耸约3,500公尺、几乎和地球壮丽山峰几乎等高的水冰峰。这片冥王星地貌的跨幅为380公里。

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A Plutonian Landscape 

Image Credit: NASA, Johns Hopkins Univ./APL, Southwest Research Institute

Explanation: This shadowy landscape of majestic mountains and icy plains stretches toward the horizon of a small, distant world. It was captured from a range of about 18,000 kilometers when New Horizons looked back toward Pluto, 15 minutes after the spacecraft's closest approach on July 14. The dramatic, low-angle, near-twilight scene follows rugged mountains still popularly known as Norgay Montes from foreground left, and Hillary Montes along the horizon, giving way to smooth Sputnik Planum at right. Layers of Pluto's tenuous atmosphere are also revealed in the backlit view. With a strangely familiar appearance, the frigid terrain likely includes ices of nitrogen and carbon monoxide with water-ice mountains rising up to 3,500 meters (11,000 feet). That's comparable in height to the majestic mountains of planet Earth. This Plutonian landscape is 380 kilometers (230 miles) across.




最后编辑于:2015-09-24 12:44

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