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Pastimes : Is anyone watching the sun lately?
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From: Sidney Reilly12/1/2012 4:45:58 AM
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And coronal mass ejections (CMEs) — huge eruptions of solar plasma that streak into space at 3 million mph (5 million kph) or more — can be even more troublesome. CMEs that hit Earth can knock out GPS signals, radio communications and power grids.

A powerful, well-aimed CME could thus wreak serious havoc on our increasingly tech-enabled and tech-dependent society. But it wouldn't destroy the planet or wipe out humanity, researchers said.

space.com
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