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Pluto changing color, ice sheet cover
Published in The Saudi Gazette on 06 - 02 - 2010

Spurned Pluto is changing its looks, donning more rouge in its complexion and altering its iceball surface here and there.
Newly released Hubble Space Telescope photos show the distant one-time planet is changing color and its ice sheets are shifting.
The photos, released by NASA Thursday, paint a Pluto that is significantly redder than it had been for the past several decades. To the layman, it has a yellow-orange hue, but astronomers say it has about 20 percent more red than it used to have.
The pictures show icy frozen nitrogen on Pluto's surface growing and shrinking, brightening in the north and darkening in the south. Astronomers say Pluto's surface is changing more than the surfaces of other bodies in the solar system. That's unexpected because a season lasts 120 years in some regions of Pluto. “It's a little bit of a surprise to see these changes happening so big and so fast,” said astronomer Marc Buie of the Southwest Research Institute in Boulder, Colo. “This is unprecedented.”
From 1954 to 2000, Pluto didn't change in color when it was photographed from Earth. But after that, it did. The red levels increased by 20 percent, maybe up to 30 percent, and stabilized from about 2000 to 2002, Buie said. It's not as red as Mars, however, Buie said.
Buie said he can explain the redness, but not why it changed so dramatically and so recently. The planet has a lot of methane, which contains carbon and hydrogen atoms. The hydrogen gets stripped off by solar winds and other factors, leaving carbon-rich areas on the surface, which tend to be red and dark. The Hubble photos were taken in 2002 and the analysis took a few years. But why Pluto changed so quickly was such a mystery that Buie held off for years on announcing what he had found, worried that he might be wrong.
It's horribly cold on Pluto with, paradoxically, the bright spots being the coldest at about


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