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Natural magnetic fields are described by NASA scientists.
1959
9.0
2016
5.9
2012
7.2
1997
6.2
2011
7.0
7.7
7.1
2009
5.7
6.4
1964
6.8
2014
2015
7.3
7.8
2010
1983
5.5
2001
6.0
1993
7.6
2013