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Space Exploration & the Cosmos
New Horizons Finds Blue Skies and Water Ice on Pluto
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<blockquote data-quote="Num7" data-source="post: 112015" data-attributes="member: 1"><p>The first color images of Pluto’s atmospheric hazes, returned by NASA’s New Horizons spacecraft last week, reveal that the hazes are blue.</p><p></p><p><img src="https://www.nasa.gov/sites/default/files/styles/full_width/public/thumbnails/image/blue_skies_on_pluto-final-2.png?itok=I4-pLTkc" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>“Who would have expected a blue sky in the Kuiper Belt? It’s gorgeous,” said Alan Stern, New Horizons principal investigator from Southwest Research Institute (SwRI), Boulder, Colorado.</p><p></p><p>The haze particles themselves are likely gray or red, but the way they scatter blue light has gotten the attention of the New Horizons science team. “That striking blue tint tells us about the size and composition of the haze particles,” said science team researcher Carly Howett, also of SwRI. “A blue sky often results from scattering of sunlight by very small particles. On Earth, those particles are very tiny nitrogen molecules. On Pluto they appear to be larger — but still relatively small — soot-like particles we call tholins.”</p><p></p><p>Scientists believe the tholin particles form high in the atmosphere, where ultraviolet sunlight breaks apart and ionizes nitrogen and methane molecules and allows them to react with one another to form more and more complex negatively and positively charged ions. When they recombine, they form very complex macromolecules, a process first found to occur in the upper atmosphere of Saturn’s moon Titan. The more complex molecules continue to combine and grow until they become small particles; volatile gases condense and coat their surfaces with ice frost before they have time to fall through the atmosphere to the surface, where they add to Pluto’s red coloring.</p><p></p><p>Read more:</p><p><a href="https://www.nasa.gov/nh/nh-finds-blue-skies-and-water-ice-on-pluto" target="_blank">New Horizons Finds Blue Skies and Water Ice on Pluto</a></p></blockquote><p></p>
[QUOTE="Num7, post: 112015, member: 1"] The first color images of Pluto’s atmospheric hazes, returned by NASA’s New Horizons spacecraft last week, reveal that the hazes are blue. [IMG]https://www.nasa.gov/sites/default/files/styles/full_width/public/thumbnails/image/blue_skies_on_pluto-final-2.png?itok=I4-pLTkc[/IMG] “Who would have expected a blue sky in the Kuiper Belt? It’s gorgeous,” said Alan Stern, New Horizons principal investigator from Southwest Research Institute (SwRI), Boulder, Colorado. The haze particles themselves are likely gray or red, but the way they scatter blue light has gotten the attention of the New Horizons science team. “That striking blue tint tells us about the size and composition of the haze particles,” said science team researcher Carly Howett, also of SwRI. “A blue sky often results from scattering of sunlight by very small particles. On Earth, those particles are very tiny nitrogen molecules. On Pluto they appear to be larger — but still relatively small — soot-like particles we call tholins.” Scientists believe the tholin particles form high in the atmosphere, where ultraviolet sunlight breaks apart and ionizes nitrogen and methane molecules and allows them to react with one another to form more and more complex negatively and positively charged ions. When they recombine, they form very complex macromolecules, a process first found to occur in the upper atmosphere of Saturn’s moon Titan. The more complex molecules continue to combine and grow until they become small particles; volatile gases condense and coat their surfaces with ice frost before they have time to fall through the atmosphere to the surface, where they add to Pluto’s red coloring. Read more: [URL='https://www.nasa.gov/nh/nh-finds-blue-skies-and-water-ice-on-pluto']New Horizons Finds Blue Skies and Water Ice on Pluto[/URL] [/QUOTE]
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