SUN'S PROTECTIVE BUBBLE IS SHRINKING: NASA.

Sun's protective bubble that shields the Earth from harmful interstellar radiation is shrinking and getting weaker, according to NASA scientists. In fact, new data has revealed that heliosphere - the protective shield of energy that surrounds our solar system - has weakened by 25 percent over the past decade and is at it lowest level since the space race began 50 years ago. Now the scientists are to launch a new mission called the Interstellar Boundary Explorer to study the heliosphere. The Ibex will be launched from the aircraft on Pegasus rocket into an orbit 1,50,000 miles above the Earth where it will listen for the shock wave which forms as our solar system meets the inter-stellar radiation. The interstellar medium which is part of the galaxy as a whole is actually quite a harsh environment. There is a very high energy galactic radiation that is very dangerous to living things.
Around 90 percent of the galactic cosmic radiation is deflected by our heliosphere, so the boundary protects us from this harsh galactic environment, co-investigator on the Ibex mission at Boston University Nathan Schwadron was quoted by the Sunday Telegraph as saying. The heliosphere is created by the solar wind when a combination of electrically charged particles and magnetic fields that emanate a more than a million miles an hour from the sun meet the intergalactic gas that fills the gaps in space between solar systems. 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 that 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. And if the heliosphere continues to weaken the scientists fear that the amount of cosmic radiation reaching the inner parts of our solar system including Earth will eventually increase. This could result in growing levels of disruption to electrical equipment damage satellites and potentially even harm life on Earth.
--Challapalli Srinivas Chakravarthy--
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