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English: Two dramatically different faces of the Red Planet appear in these comparison images showing how a global dust storm engulfed Mars with the onset of spring in the Martian southern hemisphere. When the Hubble Space Telescope imaged Mars in June 2001 (left), the seeds of the storm were caught brewing in the giant Hellas Basin (oval at 4 o'clock position on disk) and in another storm at the northern polar cap.

When Hubble photographed Mars in early September 2001 (right), the storm had already been raging across the planet for nearly two months, obscuring all surface features. The fine airborne dust blocks a significant amount of sunlight from reaching the Martian surface. Because the airborne dust is absorbing this sunlight, it heats the upper atmosphere. Seasonal global Mars dust storms have been observed from telescopes for over a century, but this is the biggest storm seen in the past several decades.

Mars looks gibbous in the right photograph because is it 26 million miles farther from Earth than in the left photo (though the pictures have been scaled to the same angular size), and our viewing angle has changed. The left picture was taken when Mars was near its closest approach to Earth for 2001; at that point the disk of Mars was fully illuminated as seen from Earth because Mars was exactly opposite the Sun.

For more information, visit: hubblesite.org/news_release/news/2001-31

Credit: NASA, James Bell (Cornell Univ.), Michael Wolff (Space Science Inst.), and the Hubble Heritage Team (STScI/AURA)
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Izvor https://www.flickr.com/photos/144614754@N02/45940079074/
Autor NASA Hubble

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This image was originally posted to Flickr by NASA Hubble at https://flickr.com/photos/144614754@N02/45940079074 (archive). It was reviewed on 26. februar 2020. by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

26. februar 2020.

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Mars Before and During Global Dust Storm

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Mars Serbian (transliteracija)

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skraćeno ime autora Serbian (transliteracija): NASA Hubble

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28. septembar 2001

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