2015년 4월 22일 수요일

Exploding Stars Help to Understand Thunderclouds on Earth - SpaceRef http://spaceref.com/earth/exploding-stars-help-to-understand-thunderclouds-on-earth.html cosmic ray etc shower etcᆞ lightningᆞ thunderstormᆞ

http://spaceref.com/earth/exploding-stars-help-to-understand-thunderclouds-on-earth.html

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