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→External links: clean up & uniformity
==External links==
==External links==
*[http://helios.gsfc.nasa.gov/cosmic.html Cosmicopia at NASA/GSFC -- Cosmic Rays] by Beth Jacob
*[http://helios.gsfc.nasa.gov/cosmic.html Cosmicopia at NASA/GSFC -- Cosmic Rays] by Beth Jacob
[[category:astronomy]]
[[Category:Astronomy]]
==See also==
==See also==
*[[Cloud condensation nuclei]]
*[[Cloud condensation nuclei]]
*[[Svensmark hypothesis]]
*[[Svensmark hypothesis]]