File:Tharsis-PIA02049.jpg

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Uploaded from wikipedia. Original caption is/was here.

Original Caption Released with Image:

The volcanoes of the Tharsis region are highlighted by this color image mosaic obtained on a single martian afternoon by the Mars Orbiter Camera (MOC) onboard the Mars Global Surveyor (MGS) spacecraft. Olympus Mons dominates the upper left corner -- it is one of the largest known volcanoes and is nearly 550 km (340 miles) wide. The grayscale image on the right shows the name of each volcano in the scene.

The white or bluish-white features are clouds. Clouds are common over the larger Tharsis volcanoes in mid-afternoon. The four largest volcanoes are more than 15 km (9 mi) high. Viewed from Earth by telescope before any spacecraft had visited the planet, astronomers often described a "W"-shaped white cloud over the Tharsis region. This "W" was actually the result of seeing the combined effects of bright clouds hanging over the Ascraeus, Pavonis, Arsia, and Olympus volcanoes. The clouds result when warm air containing water vapor rises up the slopes of each volcano, cools at the higher altitude, and causes the water vapor to freeze and form a cloud of ice crystals.

Pavonis Mons lies on the martian equator, north is up, and sunlight is illuminating the scene from the left. The picture is a mosaic of red and blue filter images taken on three consecutive orbits. The slightly blurred appearance of the left side of Arsia Mons results from distortion toward the edges of the images used to make the mosaic. To remove the blur, an image obtained on another day would be added to the mosaic--however, this image would not match well because the cloud patterns will have changed by the next day. Mosaics such as the one shown here are used to monitor changes in martian weather and to plan future observations.

JPL Image Policy

Credit line: "Courtesy NASA/JPL-Caltech."
來源 Original source:http://photojournal.jpl.nasa.gov/catalog/PIA02049
作者 NASA/JPL-Caltech
本圖像或影音收錄於美國國家航空暨太空總署 (NASA)噴射推進實驗室(Jet Propulsion Laboratory),其照片編號為: PIA02049

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Public domain 本作品由NASA創作,屬於公有領域。根據NASA的版權政策:“NASA的創作除非另有聲明否則不受版權保護。”(參見:Template:PD-USGov/zhNASA版權政策JPL圖像使用政策
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The original description page was here. All following user names refer to en.wikipedia.
  • 2004-05-06 18:38 Wwoods 768×640×8 (60174 bytes) Tharsis region on Mars; http://photojournal.jpl.nasa.gov/catalog/PIA02049 ;{{msg:PD}}

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目前2008年4月29日 (二) 15:59於 2008年4月29日 (二) 15:59 版本的縮圖768 × 640(59 KB)Njardarlogar{{Information |Description= Uploaded from wikipedia. Original caption is/was [http://en.wikipedia.org/wiki/Image:Tharsis-PIA02049.jpg here]. '''Original Caption Released with Image''': The volcanoes of the Tharsis region are highlighted by this colo

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