Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.astronet.ru/db/xware/msg/apod/1995-08-15
Дата изменения: Sun Feb 12 00:44:44 2006
Дата индексирования: Sat Dec 29 09:25:24 2007
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Поисковые слова: herbig-haro object
Venus: Earth's Sister Planet
Astronomy Picture of the Day
    


Venus: Earth's Sister Planet
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Venus: Earth's Sister Planet
Credit: NASA, Galileo, Copyright Calvin J. Hamilton
Explanation: This picture in visible light was taken by the Galileo spacecraft. Venus is very similar to Earth in size and mass - and so is sometimes referred to as Earth's sister planet - but Venus has a quite different climate. Venus' thick clouds and closeness to the Sun (only Mercury is closer) make it the hottest planet - much hotter than the Earth. Humans could not survive there, and no life of any sort has ever been found. When Venus is visible it is usually the brightest object in the sky after the Sun and the Moon. More than 20 spacecraft have visited Venus including Venera 9, which landed on the surface, and Magellan, which used radar to peer through the clouds and make a map of the surface. There are still many things about Venus's unusual atmosphere that astronomers don't understand.

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Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
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NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.

Based on Astronomy Picture Of the Day

Publications with keywords: Earth - Venus
Publications with words: Earth - Venus
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