From: Sam Wormley on 27 Jul 2010 17:23 NASA Science News for July 27, 2010 Researchers using NASA's THEMIS spacecraft have discovered a form of space weather that packs the punch of an earthquake and plays a key role in sparking bright Northern Lights. FULL STORY at http://science.nasa.gov/science-news/science-at-nasa/2010/27jul_spacequakes/ A spacequake is a temblor in Earth's magnetic field. It is felt most strongly in Earth orbit, but is not exclusive to space. The effects can reach all the way down to the surface of Earth itself.
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