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Sun's protective 'bubble' is shrinking

August 12th, 2009
Categories: News

Link: http://www.telegraph.co.uk/news/worldnews/northamerica/usa/3222476/Suns-protective-bubble-is-shrinking.html

The protective bubble around the sun that helps to shield the Earth from harmful interstellar radiation is shrinking and getting weaker, Nasa scientists have warned. Data has shown that the sun's heliosphere is shrinking. New data has revealed that the heliosphere, the protective shield of energy that surrounds our solar system, has weakened by 25 per cent over the past decade and is now at it lowest level since the space race began 50 years ago. Scientists are baffled at what could be causing the barrier to shrink in this way and are to launch mission to study the heliosphere. At the boundary where they meet a shock wave is formed that deflects interstellar radiation around the solar system as it travels through the galaxy. The scientists hope the IBEX mission will allow them to gain a better understanding of what happens at this boundary and help them predict what protection it will offer in the future. Without the heliosphere the harmful intergalactic cosmic radiation would make life on Earth almost impossible by destroying DNA and making the climate uninhabitable. Sun Makes History: First Spotless Month in a Century | George Noory with Holly & Stan Deyo part 1-8

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