Music Review: Ethereal Songs Made More Expansive With An Orchestra’s Multitude Of Colors Joanna Newsom’s perpetual-motion harp playing provides settings that encompass madrigals, Appalachian ballads and African griot songs, and her voice can sound piercing or intimate.... Read Full Article Fears Rise For Airbus Jobs FEARS of significant job losses at one of Airbus’s British plants were growing this weekend amid mounting speculation that it would be sold to an American group, Spirit Aerosystems.... Read Full Article Probe Begins Journey To Mars An unmanned Delta rocket blasts off from Cape Canaveral Air Force Station, sending a water-analysing science probe on its way to Mars.... Read Full Article Personal Health: Cracking The Code To The Memory Vault Sticky notes, mnemonics and other tips for the forgetful.... Read Full Article Bush’s Talks With Neighbors Are Overshadowed By Storm Hurricane Dean’s expected landfall on the Yucatán Peninsula in Mexico threw into doubt three-way talks that were scheduled for Tuesday.... Read Full Article |
Observatory: On A Moon Of Saturn, Fractures, Hot Spots And Jets Of Water VaporThanks to the Cassini mission, scientists have learned enough about Saturns frigid moon Enceladus to conclude that it is one of the few volcanically active bodies in the solar system (although it is icy volcanism, not hot volcanism as on Earth). Cassini Imaging/NASARelated Observatory: Two, Deux, Dos: Heavily Used Words Evolve More Slowly (October 16, 2007) Observatory: Arthritis Fails to Slow Invading Toads in Australian Fields (October 16, 2007) More Observatory Columns » Web LinksAssociation of the jets of Enceladus with the warmest regions on its south-polar fractures (Nature) Among the discoveries are several in the moons south polar region: a series of fractures known as tiger stripes, anomalous hot spots along the fractures and jets of water vapor and icy particles spewing from the surface. A new study ties those discoveries together. By analyzing Cassini images of the region taken from different directions over two years, Joseph N. Spitale and Carolyn C. Porco of the Space Science Institute in Boulder, Colo., have been able to locate the source of some of the jets through triangulation. They report in Nature that the jets emanate from the hot spots along the tiger stripes. The finding lends credence to the idea that the jets are a result of shear heating, in which tidal forces related to Saturns gravitational pull cause the sides of the fractures to slip and rub against each other. The researchers say a model of shear heating along the tiger stripes correlates closely with the location of some of the jets and hot spots. Tag CloudExternal InformationAdditional InformationEssay: Darwin’s Era, Modern Themes: Science, Faith and Publication...Arecibo Radio Telescope Is Back in Business After 6-Month Spruce-Up... Global Effort to Save Endangered Crops Gets $37.5 Million Infusion... Studies Report Inducing Out-of-Body Experience... Where Am I?News Main Page - Business - Observatory: On A Moon Of Saturn, Fractures, Hot Spots And Jets Of Water Vapor |
i8news.com |