File:Vénus_par_Hubble.jpg
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![File:Vénus par Hubble.jpg](http://upload.wikimedia.org/wikipedia/commons/thumb/1/1a/V%C3%A9nus_par_Hubble.jpg/412px-V%C3%A9nus_par_Hubble.jpg)
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摘要
描述Vénus par Hubble.jpg |
English: This is a NASA Hubble Space Telescope ultraviolet-light image of the planet Venus, taken on January 24 1995, when Venus was at a distance of 70.6 million miles (113.6 million kilometers) from Earth.
Venus is covered with clouds made of sulfuric acid, rather than the water-vapor clouds found on Earth. These clouds permanently shroud Venus' volcanic surface, which has been radar mapped by spacecraft and from Earth-based telescope. At ultraviolet wavelengths cloud patterns become distinctive. In particular, a horizontal "Y"-shaped cloud feature is visible near the equator. Similar features were seen from Mariner 10, Pioneer Venus, and Galileo spacecrafts. This global feature might indicate atmospheric waves, analogous to high and low pressure cells on Earth. Bright clouds toward Venus' poles appear to follow latitude lines. The polar regions are bright, possibly showing a haze of small particles overlying the main clouds. The dark regions show the location of enhanced sulfur dioxide near the cloud tops. From previous missions, astronomers know that such features travel east to west along with the Venus' prevailing winds, to make a complete circuit around the planet in four days. Because Venus is closer to the Sun than Earth, the planet appears to go through phases, like the Moon. When Venus swings close to Earth the planet's disk appears to grow in size, but changes from a full disk to a crescent. The image was taken with the Wide Field Planetary Camera-2, in PC mode. False color has been used enhance cloud features.Français : photo de la planète Vénus prise par le télescope spatial Hubble |
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来源 | http://hubblesite.org/gallery/album/solar_system/pr1995016g/web_print/ |
作者 | L. Esposito (University of Colorado, Boulder), and NASA |
许可协议
Public domainPublic domainfalsefalse |
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本文件完全由NASA创作,在美国属于公有领域。根据NASA的版权方针,NASA的材料除非另有声明否则不受版权保护。(参见Template:PD-USGov/zh、NASA版权方针页面或JPL图片使用方针。) | ![]() |
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21 3 1995
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2010年8月31日 (二) 20:46 | ![]() | 500 × 800(15 KB) | Jupiter75 | {{Information |Description={{fr|1=photo de la planète Vénus prise par le télescope spatial Hubble}} |Source=http://hubblesite.org/gallery/album/solar_system/pr1995016g/web_print/ |Author=NASA, ESA |Date=2010/08/31 |Permission= |other_versions= }} |
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