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File:Vénus par Hubble.jpg

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Descrizione
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
Data
Fonte http://hubblesite.org/gallery/album/solar_system/pr1995016g/web_print/
Autore L. Esposito (University of Colorado, Boulder), and NASA

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Public domain Questo file è nel pubblico dominio perché creato dalla NASA. La politica sul copyright della NASA afferma che «il materiale della NASA non è protetto da copyright a meno che non sia specificato altrimenti». (NASA copyright policy e JPL Image Use Policy).
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Data/OraMiniaturaDimensioniUtenteCommento
attuale07:34, 28 mar 2015Miniatura della versione delle 07:34, 28 mar 2015489 × 711 (22 KB)Jcpag2012crop from original source file
07:32, 28 mar 2015Miniatura della versione delle 07:32, 28 mar 2015500 × 800 (23 KB)Jcpag2012higher resolution
22:46, 31 ago 2010Miniatura della versione delle 22:46, 31 ago 2010500 × 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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