( ( In addition ) ( , ( ( just ( ( like ( the Earth ) ) ( , ( it ( ( ( has ( a ( ( ( North and ) South ) ( magnetic Pole ) ) ) ) , ) however ) ) ) ) ) ( , ( ( ( ( every ( 11 years ) ) , ) ( these poles ) ) ( ( ( switch ( their locations ) ) ( relative ( to ( ( the poles ) ( defined ( by ( ( the ( Sun 's ) ) ( spin axis ) ) ) ) ) ) ) ) . ) ) ) ) ) )
(ROOT (S (PP (IN In) (NP (NN addition))) (, ,) (SBAR (RB just) (S (PP (IN like) (NP (DT the) (NN Earth))) (, ,) (NP (PRP it)) (VP (VBZ has) (NP (DT a) (ADJP (JJ North) (CC and) (JJ South)) (JJ magnetic) (NN Pole)) (, ,) (ADVP (RB however))))) (, ,) (NP (NP (DT every) (CD 11) (NNS years)) (, ,) (NP (DT these) (NNS poles))) (VP (VB switch) (NP (PRP$ their) (NNS locations)) (ADVP (JJ relative) (PP (TO to) (NP (NP (DT the) (NNS poles)) (VP (VBN defined) (PP (IN by) (NP (NP (DT the) (NNP Sun) (POS 's)) (NN spin) (NNS axis)))))))) (. .)))
In addition, just like the Earth, it has a North and South magnetic Pole, however, every 11 years, these poles switch their locations relative to the poles defined by the Sun's spin axis.
(ROOT (S (NP (NP (DT The) (NN earth) (POS 's)) (JJ magnetic) (NNS poles)) (VP (VBP have) (VP (VBN switched) (NP (NNS places)) (ADVP (RB repeatedly)) (PP (IN in) (NP (DT the) (NN past))))) (. .)))