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Semanario celeste 26 noviembre



Semanario celeste a partir del 21 de noviembre

Semanario celeste a partir del 21 de noviembre



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  • http://1.bp.blogspot.com/_fXzRYbEw4hA/TClhYBhpuPI/AAAAAAAADgM/Zb9vxbzhTsQ/s1600/epoxi%2Bcometa.jpg <br /> <br /> Data collected by Deep Impact&apos;s onboard infrared spectrometer show without a doubt that the particles are made of frozen H2O, i.e., ice. Chunks consist of micron-sized ice grains loosely stuck together in clumps a few centimeters to a few tens of centimeters wide. <br />
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  • http://science.nasa.gov/science-news/science-at-nasa/2010/18nov_cometsnowstorm/ <br /> This contrast-enhanced image obtained during Deep Impact&apos;s Nov. 4th flyby of Comet Hartley 2 reveals a cloud of icy particles surrounding the comet&apos;s active nucleus <br /> Snowstorm Engulfs Hartley 2 <br /> Nov. 18, 2010:&#xA0; NASA has just issued a travel advisory for spacecraft: Watch out for Comet Hartley 2, it is experiencing a significant winter snowstorm. <br /> Deep Impact photographed the unexpected tempest when it flew past the comet&apos;s nucleus on Nov. 4th at a distance of only 700 km (435 miles). At first, researchers only noticed the comet&apos;s hyperactive jets. The icy nucleus is studded with them, flamboyantly spewing carbon dioxide from dozens of sites. A closer look revealed an even greater marvel, however. The space around the comet&apos;s core is glistening with chunks of ice and snow, some of them possibly as large as a basketball. <br /> We&apos;ve never seen anything like this before," says University of Maryland professor Mike A&apos;Hearn, principal investigator of Deep Impact&apos;s EPOXI mission. "It really took us by surprise." <br /> Before the flyby of Hartley 2, international spacecraft visited four other comet cores&#x2014;Halley, Borrelly, Wild 2, and Tempel 1. None was surrounded by "comet snow." Tempel 1 is particularly telling because Deep Impact itself performed the flyby. The very same high resolution, high dynamic range cameras that recorded snow-chunks swirling around Hartley 2 did not detect anything similar around Tempel 1. <br /> "This is a genuinely new phenomenon," says science team member Jessica Sunshine of the University of Maryland. "Comet Hartley 2 is not like the other comets we&apos;ve visited." <br /> The &apos;snowstorm&apos; occupies a roughly-spherical volume centered on Hartley 2&apos;s spinning nucleus. The dumbbell-shaped nucleus, measuring only 2 km from end to end, is tiny compared to the surrounding swarm. "The ice cloud is a few tens of kilometers wide--and possibly much larger than that," says A&apos;Hearn. "We still don&apos;t know for sure how big it is." <br /> Data collected by Deep Impact&apos;s onboard infrared spectrometer show without a doubt that the particles are made of frozen H2O, i.e., ice. Chunks consist of micron-sized ice grains loosely stuck together in clumps a few centimeters to a few tens of centimeters wide. <br />
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Semanario celeste 26 noviembre Semanario celeste 26 noviembre Presentation Transcript

  • La‚Ä©sonda‚Ä©EPOXI‚Ä©(previamente‚Ä©conocida‚Ä©como‚Ä©Deep‚Ä©Impact)‚Ä©tuvo‚Ä©un‚Ä© encuentro‚Ä©cercano‚Ä©con‚Ä©el‚Ä©cometa‚Ä©Hartley‚Ä©2‚Ä©el‚Ä©4‚Ä©de‚Ä©noviembre‚Ä©de‚Ä©2010
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  • Es‚Ä©m√°s‚Ä©o‚Ä©menos‚Ä©la‚Ä©distancia‚Ä©entre‚Ä©Monterrey‚Ä©y‚Ä©Le√≥n,‚Ä©Guanajuato
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  • La‚Ä©nube‚Ä©de‚Ä©hielo‚Ä©Oene‚Ä©cuando‚Ä©menos‚Ä©30‚Ä©km‚Ä©de‚Ä©di√°metro Los‚Ä©espectr√≥metros‚Ä©del‚Ä©EPOXI‚Ä©revelaron‚Ä©que‚Ä©‚Äďsin‚Ä©lugar‚Ä©a‚Ä©dudas‚Äź‚Ä© se‚Ä©trata‚Ä©de‚Ä©agua‚Ä©congelada.
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